Related
I'm running MySQL 5.6.
I have two related tables:
CREATE TABLE Cars (
id INT NOT NULL AUTO_INCREMENT,
plate VARCHAR(16) NOT NULL,
flag TINYINT,
PRIMARY KEY(id)
)
and:
CREATE TABLE Rents (
id INT NOT NULL AUTO_INCREMENT,
out_date DATE NOT NULL,
in_date DATE,
car_id INT,
FOREIGN KEY (car_id) REFERENCES Cars(id),
PRIMARY KEY(id)
)
I can have multiple rents for each car (0 to many).
I need to select all vehicles in table Cars (with flag = 1) along with their status i.e. I need to know if each car is currently unavailable (only out_date is filled) or availabe (out_date and in_date filled) of course also vehicles without any rents are to be considered available.
The result set need to include out_date and in_date values [Update 17/07/2022].
I tought to use something like:
SELECT
*,
IF(Rents.in_date IS NOT NULL AND Rents.out_date IS NOT NULL, 1, IF(Rents.id IS NULL, 1, 0)) AS status
FROM Cars
LEFT JOIN Rents ON Cars.id = Rent.Car_id WHERE Cars.Flag = 1
but this of course will just return all the rows with positive flag match and a status evaluation (0 unavailable, 1 available):
id | plate | flag | id | out_date | in_date | car_id | status
---------------------------------------------------------------------
'1', 'FA787MX', '1', '1', '2022-07-14', '2022-07-15', '1', '1'
'1', 'FA787MX', '1', '2', '2022-07-16', NULL, '1', '0'
'3', 'AB124DF', '1', '4', '2022-07-13', '2022-07-14', '3', '1'
'4', 'CC666VC', '1', NULL, NULL, NULL, NULL, '1'
'5', 'GG435ED', '1', '5', '2022-07-16', NULL, '5', '0'
While I need to have this (edited 17/07/2022):
'1', 'FA787MX', '1', '2', '2022-07-16', NULL, '1', '0'
'3', 'AB124DF', '1', '4', '2022-07-13', '2022-07-14', '3', '1'
'4', 'CC666VC', '1', NULL, NULL, NULL, NULL, '1'
'5', 'GG435ED', '1', '5', '2022-07-16', NULL, '5', '0'
i.e. only the second row of FA787MX car should be mantained since it's the most recent out_date value (no matter if it's id is higher or lower).
For the sake of completeness: There is no guarantee that rental ids will be kept consistent with their rental history. In other words you cannot be sure that for a given car the rental where in_date = NULL is the correct one but you should compare them by out_date value.
Data sample:
INSERT INTO `Cars` (`id`, `plate`, `flag`) VALUES (1, 'FA787MX', 1);
INSERT INTO `Cars` (`id`, `plate`, `flag`) VALUES (2, 'EX431YY', 0);
INSERT INTO `Cars` (`id`, `plate`, `flag`) VALUES (3, 'AB124DF', 1);
INSERT INTO `Cars` (`id`, `plate`, `flag`) VALUES (4, 'CC666VC', 1);
INSERT INTO `Cars` (`id`, `plate`, `flag`) VALUES (5, 'GG435ED', 1);
INSERT INTO `Rents` (`id`, `out_date`, `in_date`, `car_id`) VALUES (1, '2022-07-14', '2022-07-15', 1);
INSERT INTO `Rents` (`id`, `out_date`, `in_date`, `car_id`) VALUES (2, '2022-07-16', NULL, 1);
INSERT INTO `Rents` (`id`, `out_date`, `in_date`, `car_id`) VALUES (3, '2022-07-16', NULL, 2);
INSERT INTO `Rents` (`id`, `out_date`, `in_date`, `car_id`) VALUES (4, '2022-07-13', '2022-07-14', 3);
INSERT INTO `Rents` (`id`, `out_date`, `in_date`, `car_id`) VALUES (5, '2022-07-16', NULL, 5);
One option is to join to find only those rentals that are still outstanding (in_date IS NULL). That will drop the old rentals having in_date not null.
Based on the updated requirements, there are a few ways to do it. One is a simple outer join to find the most recent rental per car to obtain the corresponding in_date as well...
MySQL 5.6 fiddle
SELECT Cars.*
, Rents.out_date
, Rents.in_date
, Rents.id IS NULL OR Rents.in_date IS NOT NULL AS status_final
FROM Cars
LEFT JOIN Rents
ON Cars.id = Rents.Car_id
LEFT JOIN Rents AS r2
ON Rents.out_date < r2.out_date
AND Rents.Car_id = r2.Car_id
WHERE Cars.Flag = 1
AND r2.Car_id IS NULL
ORDER BY Cars.id
;
The result:
id
plate
flag
out_date
in_date
status_final
1
FA787MX
1
2022-07-16
0
3
AB124DF
1
2022-07-13
2022-07-14
1
4
CC666VC
1
1
5
GG435ED
1
2022-07-16
0
Based on the original requirements: Try this (fiddle):
SELECT Cars.*
, Rents.in_date
, CASE WHEN in_date IS NOT NULL OR Rents.id IS NULL THEN 1 ELSE 0 END AS status_final
FROM Cars
LEFT JOIN Rents
ON Cars.id = Rents.Car_id
AND in_date IS NULL
WHERE Cars.Flag = 1
;
and if the results contain only those with in_date IS NULL, this reduces to:
SELECT Cars.*
, out_date
, Rents.in_date
, Rents.id IS NULL AS status_final
FROM Cars
LEFT JOIN Rents
ON Cars.id = Rents.Car_id
AND in_date IS NULL
WHERE Cars.Flag = 1
;
Result:
id
plate
flag
out_date
in_date
status_final
1
FA787MX
1
2022-07-16
0
3
AB124DF
1
1
4
CC666VC
1
1
5
GG435ED
1
2022-07-16
0
If your version of MySql is 8.0+ use ROW_NUMBER() window function to pick the latest row for each car in Rents:
SELECT c.*, r.*,
r.out_date IS NULL OR r.in_date IS NOT NULL status
FROM Cars c
LEFT JOIN (
SELECT *, ROW_NUMBER() OVER (PARTITION BY car_id ORDER BY out_date DESC) rn
FROM Rents
) r ON r.car_id = c.id AND r.rn = 1
WHERE c.flag = 1;
For previous versions use NOT EXISTS:
SELECT c.*, r.*,
r.out_date IS NULL OR r.in_date IS NOT NULL status
FROM Cars c
LEFT JOIN (
SELECT r1.*
FROM Rents r1
WHERE NOT EXISTS (
SELECT *
FROM Rents r2
WHERE r2.car_id = r1.car_id AND r2.out_date > r1.out_date
)
) r ON r.car_id = c.id
WHERE c.flag = 1;
See the demo.
If you imagine the result of your query as a table, you can easily write a query that would give you what you need (the subquery is just yours with the select spelled out to give a unique column name to the second id column, as it seemed useful - the only way to uniquely identify a row):
SELECT MAX(rent_id) FROM (
SELECT
Cars.id as id,
plate,
flag,
Rents.id as rent_id,
out_date,
in_date,
car_id,
IF(Rents.in_date IS NOT NULL AND Rents.out_date IS NOT NULL, 1, IF(Rents.id IS NULL, 1, 0)) AS status
FROM Cars
LEFT JOIN Rents ON Cars.id = Rents.car_id WHERE Cars.Flag = 1
) as rental_status
WHERE status = 0
GROUP BY car_id;
Which tells you which rows are interesting:
+--------------+
| MAX(rent_id) |
+--------------+
| 2 |
| 5 |
+--------------+
Now you can use a join to return the results of your initial query only for the interesting rows. To avoid having to spell out that query all over again, MySQL 8 has a way to stash the results of your core query and use it like a table:
WITH
status_data AS (
SELECT
Cars.id as id,
plate,
flag,
Rents.id as rent_id,
out_date,
in_date,
car_id,
IF(Rents.in_date IS NOT NULL AND Rents.out_date IS NOT NULL, 1, IF(Rents.id IS NULL, 1, 0)) AS status
FROM Cars
LEFT JOIN Rents ON Cars.id = Rents.car_id WHERE Cars.Flag = 1
)
SELECT * from status_data
JOIN (
SELECT MAX(rent_id) as rent_id FROM status_data
WHERE status = 0
GROUP BY car_id
) as ids using(rent_id);
Giving the result:
+---------+----+---------+------+------------+---------+--------+--------+
| rent_id | id | plate | flag | out_date | in_date | car_id | status |
+---------+----+---------+------+------------+---------+--------+--------+
| 2 | 1 | FA787MX | 1 | 2022-07-16 | NULL | 1 | 0 |
| 5 | 5 | GG435ED | 1 | 2022-07-16 | NULL | 5 | 0 |
+---------+----+---------+------+------------+---------+--------+--------+
I need to get a value from another table but where there may be 5/6 results, I only need to show the latest one. I've tried the following:
SELECT s.Mileage
, s.PurchasePrice
, v.make
, v.model
, v.vrm
, c.CleanLive
FROM StockBook s
LEFT
JOIN Vehicles v
ON v.VehicleID = s.VehicleID
LEFT
JOIN CapVals c
ON c.LeadID = (SELECT C1.CleanLive
FROM CapVals C1
WHERE s.LeadID = c.LeadID
ORDER
BY C1.Date
LIMIT 1
)
ORDER
BY StockBookID
Which is working as a query but not showing CleanLive value.
I've set up a sample data set and DB Fiddle here:
CREATE TABLE `Vehicles` (
`VehicleID` int(11) NOT NULL,
`vrm` varchar(15) NOT NULL,
`make` varchar(40) NOT NULL,
`model` varchar(40) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE `StockBook` (
`StockBookID` int(11) NOT NULL,
`VehicleID` int(11) NOT NULL,
`LeadID` int(11) NOT NULL,
`Mileage` int(11) NOT NULL,
`PurchasePrice` decimal(15,2) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE `CapVals` (
`CapValsID` int(11) NOT NULL,
`LeadID` int(11) DEFAULT NULL,
`CleanLive` int(11) DEFAULT NULL,
`Date` datetime DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `Vehicles` (`VehicleID`, `vrm`, `make`, `model`) VALUES
(1, 'M900WRD', 'Vauxhall', 'Signum');
INSERT INTO `StockBook` (`StockBookID`, `LeadID`, `VehicleID`, `Mileage`, `PurchasePrice`) VALUES
(1, 1, 1, 17000, 15000.00);
INSERT INTO `CapVals` (`CapValsID`, `LeadID`, `CleanLive`, `Date`) VALUES
(6455, 1, 1540, '2019-12-04 15:02:29'),
(6456, 1, 1540, '2019-12-04 15:02:29'),
(6457, 1, 1540, '2019-12-04 15:02:29');
https://www.db-fiddle.com/f/b4fQuMVpXHGxqgYJ4ia92w/4
You can try this
SELECT Stock.Mileage, Stock.PurchasePrice, Vehi.make, Vehi.model, Vehi.vrm,
(SELECT CleanLive from CapVals a WHERE a.LeadID = Stock.LeadID ORDER BY DATE DESC LIMIT 1) AS CleanLive
FROM StockBook Stock
LEFT JOIN Vehicles Vehi
ON Stock.VehicleID=Vehi.VehicleID
ORDER BY StockBookID
SELECT v.vehicleID
, v.vrm
, v.make
, v.model
, s.stockbookid
, s.leadid
, s.mileage
, s.purchaseprice
, c.capvalsid
, c.cleanlive
, c.date
FROM vehicles v
JOIN stockbook s
ON s.vehicleid = v.vehicleid
JOIN capvals c
ON c.leadid = s.leadid
JOIN
( SELECT leadid,MAX(capvalsid) capvalsid FROM capvals GROUP BY leadid ) x
ON x.leadid = c.leadid
AND x.capvalsid = c.capvalsid;
+-----------+---------+----------+--------+-------------+--------+---------+---------------+-----------+-----------+---------------------+
| vehicleID | vrm | make | model | stockbookid | leadid | mileage | purchaseprice | capvalsid | cleanlive | date |
+-----------+---------+----------+--------+-------------+--------+---------+---------------+-----------+-----------+---------------------+
| 1 | M900WRD | Vauxhall | Signum | 1 | 1 | 17000 | 15000.00 | 6457 | 1540 | 2019-12-04 15:02:29 |
+-----------+---------+----------+--------+-------------+--------+---------+---------------+-----------+-----------+---------------------+
Use Row_number concept, which will avoid the duplicate rows and give you recent one,
FIDDLE DEMO
SELECT Stock.Mileage, Stock.PurchasePrice, Vehi.make, Vehi.model, Vehi.vrm,
X.CleanLive as CleanLive
FROM StockBook Stock
LEFT JOIN Vehicles Vehi ON Stock.VehicleID=Vehi.VehicleID
LEFT JOIN (SELECT #LeadID:=LeadID,C1.LeadID, CleanLive, C1.Date, #row_number:=CASE WHEN #LeadID = LeadID THEN #row_number + 1 ELSE 1 END AS num
FROM CapVals AS C1, (SELECT #LeadID:=0,#row_number:=0) as t ORDER BY C1.Date DESC) X ON X.LeadID = Stock.LeadID AND X.num = 1
ORDER BY StockBookID
Here I am having 3 table using I have to take the count
trip_details
id allocationId tripId
1 7637 aIz2o
2 7626 osseC
3 7536 01LEC
4 7536 78w2w
5 7640 S60zF
6 7548 ruaoR
7 7548 Qse6s
escort_allocation
id allocationId escortId
3 7637 1
4 7626 1
5 7627 1
6 7536 1
7 7640 1
7 7548 1
cab_allocation
allocationId allocationType
7637 Daily Trip
7626 Daily Trip
7627 Daily Trip
7536 Adhoc Trip
7640 Adhoc Trip
7548 Daily Trip
Using above table I have to get the count, I tried but it is not happening my expected results.
I tried sql query
SELECT a.`tripId`
FROM `trip_details` a
INNER JOIN escort_allocation b ON a.`allocationId` = b.`allocationId`
GROUP BY a.`allocationId`
LIMIT 0 , 30
I am getting like this
tripId
01LEC
ruaoR
osseC
aIz2o
S60zF
total 6 tripId i got ,so now I want to take the count so I am using this query
SELECT COUNT(*)
FROM `trip_details` a
INNER JOIN escort_allocation b ON a.`allocationId` = b.`allocationId`
GROUP BY a.`allocationId`
LIMIT 0 , 30
but this query is not working.I am getting results like below
2
2
1
1
1
MY MYSQL TABLES AND VALUES LOOK LIKE THIS
CREATE TABLE `trip_details` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`allocationId` int(11) NOT NULL,
`tripId` varchar(100) NOT NULL,
PRIMARY KEY (`id`),
KEY `tripId` (`tripId`),
KEY `allocationId` (`allocationId`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 ;
INSERT INTO trip_details
(id, allocationId, tripId)
VALUES
(1, 7637, '00SwM'),
(2, 7626, '00SwM'),
(3, 7536, '00SwM'),
(4, 7536, '01hEU'),
(5, 7640, '01hEU'),
(6, 7548, 'IRZMS'),
(7, 7548, 'IRZMS');
CREATE TABLE `escort_allocation` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`allocationId` int(11) NOT NULL,
`escortId` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 ;
INSERT INTO escort_allocation
(id, allocationId, escortId)
VALUES
(1, 7637, 'ssda'),
(2, 7626, 'adad'),
(3, 7627, 'sfsaf'),
(4, 7536, 'ssaf'),
(5, 7640, 'asf'),
(6, 7548, 'a3r');
CREATE TABLE `cab_allocation` (
`allocationId` int(11) NOT NULL AUTO_INCREMENT,
`allocationType` enum('Daily Trip','Adhoc Trip') NOT NULL,
PRIMARY KEY (`allocationId`)
) ENGINE=InnoDB AUTO_INCREMENT=7695 DEFAULT CHARSET=latin1;
INSERT INTO cab_allocation
(allocationId, allocationType)
VALUES
(7637, 'Daily Trip'),
(7626, 'Daily Trip'),
(7627, 'Daily Trip'),
(7536, 'Adhoc Trip'),
(7640, 'Adhoc Trip'),
(7548, 'Daily Trip');
You can try this
SELECT COUNT(DISTINCT (a.`tripId`))
FROM `trip_details` a
INNER JOIN escort_allocation b ON a.`allocationId`=b.`allocationId`
LIMIT 0 , 30
because of GROUP BY there is separate count for all allocationId.
With this, you should get the tripid and the amount:
SELECT COUNT(a.tripId) as total, a.tripId as tripId
FROM trip_details a INNER JOIN escort_allocation b
ON a.allocationId = b.allocationId
GROUP BY a.allocationId LIMIT 0 , 30
You may use:
SELECT COUNT(DISTINCT a.allocationId)
FROM
trip_details a
INNER JOIN
escort_allocation b
ON a.allocationId = b.allocationId
Previously you used COUNT(*) and also used GROUP BY so the counts of rows you were getting are from individual groups.
Update-2:
SELECT
(
SELECT COUNT(*) FROM trip_details
) AS Total_Trip_Count,
COUNT(T.tripId) as Escort_Count,
(
SELECT COUNT(*) FROM
(
SELECT a.allocationId
FROM escort_allocation a
INNER JOIN cab_allocation c ON a.allocationId = c.allocationId
WHERE c.allocationType = 'Adhoc Trip'
GROUP BY a.allocationId
) AS Ad
) AS Adhoc_Trip_Count
FROM
(
SELECT a.tripId FROM
trip_details a
INNER JOIN
escort_allocation b
ON a.allocationId = b.allocationId
GROUP BY a.allocationId
) AS T
I have tables:
CREATE TABLE IF NOT EXISTS `category` (
`id` int(11) NOT NULL,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `category` (`id`, `name`) VALUES
(1, 'Computers'),
(2, 'Bikes');
CREATE TABLE IF NOT EXISTS `fields` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`field_name` varchar(255) DEFAULT NULL,
`cid` text NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
INSERT INTO `fields` (`id`, `field_name`, `cid`) VALUES
(1, 'Processor', '1'),
(2, 'Display', '1'),
(3, 'Brand', '2');
CREATE TABLE IF NOT EXISTS `fields_values` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`field_id` int(11) DEFAULT NULL,
`field_value` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;
INSERT INTO `fields_values` (`id`, `field_id`, `field_value`) VALUES
(1, 1, 'Intel Pentium 3'),
(2, 2, '27 inch'),
(3, 3, 'BMX'),
(4, 1, 'AMD Radeon'),
(5, 1, 'Intel Atom'),
(6, 2, '22 inch');
CREATE TABLE IF NOT EXISTS `products` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`cid` text NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=6 ;
INSERT INTO `products` (`id`, `name`, `cid`) VALUES
(1, 'Computer1', 1),
(2, 'Bike1.BMX', 2),
(3, 'Bike3', 2),
(4, 'Intel Atom', 1),
(5, 'Computer Radeon', 1);
CREATE TABLE IF NOT EXISTS `products_to_fields_values` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`product_id` int(11) DEFAULT NULL,
`field_value_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ;
INSERT INTO `products_to_fields_values` (`id`, `product_id`, `field_value_id`) VALUES
(1, 1, 1),
(2, 2, 3),
(3, 1, 2),
(4, 4, 5);
My request looks like:
SELECT ft.id field_id, ft.field_name, fvt.field_value, fvt.id field_value_id, COUNT( DISTINCT pid ) count
FROM FIELDS ft
JOIN fields_values fvt ON ( ft.id = fvt.field_id )
JOIN products_to_fields_values pfv ON ( pfv.field_value_id = fvt.id )
JOIN products pt ON ( pt.id = pfv.product_id )
LEFT JOIN (
SELECT ft.id field_id, ft.field_name, fvt.field_value, fvt.id field_value_id, pt.name, pt.id pid
FROM FIELDS ft
JOIN fields_values fvt ON ( ft.id = fvt.field_id )
JOIN products_to_fields_values pfv ON ( pfv.field_value_id = fvt.id )
JOIN products pt ON ( pt.id = pfv.product_id )
GROUP BY pt.id
)LJ ON pfv.product_id = LJ.pid
WHERE FIND_IN_SET( 1, pt.cid )
GROUP BY ft.field_name, fvt.field_value
LIMIT 0 , 30
This request will return (I'm trying to build faceted filter):
field_id field_name field_value field_value_id count
2 Display 27 inch 2 1
1 Processor Intel Atom 5 1
1 Processor Intel Pentium 3 1
But I have other values in this table: fields_values like: AMD Radeon and 22 inch.
Where is my mistake in the request?
Thanks!
EDIT:
I'm expect to getting result:
field_id field_name field_value field_value_id count
2 Display 22 inch 6 0
2 Display 27 inch 2 1
1 Processor AMD Radeon 4 0
1 Processor Intel Atom 5 1
1 Processor IntelPentium3 1 1
Where count is a products count.
Here is a work SQL, but im not sure you have build your structure correctly.
SELECT
ft.id field_id, ft.field_name, fvt.field_value, fvt.id as field_value_id, COUNT( DISTINCT pid ) count
FROM products AS pt
JOIN products_to_fields_values AS pfv ON pfv.product_id = pt.id
JOIN fields_values AS fvt ON fvt.field_id = pfv.field_value_id
JOIN fields AS ft on ft.id = fvt.field_id
LEFT JOIN (
SELECT ft.id field_id, ft.field_name, fvt.field_value, fvt.id field_value_id, pt.name, pt.id pid
FROM fields ft
JOIN fields_values fvt ON ( ft.id = fvt.field_id )
JOIN products_to_fields_values pfv ON ( pfv.field_value_id = fvt.id )
JOIN products pt ON ( pt.id = pfv.product_id )
GROUP BY pt.id
)LJ ON pfv.product_id = LJ.pid
WHERE FIND_IN_SET( 1, pt.cid )
GROUP BY ft.field_name, fvt.field_value
LIMIT 0 , 30
In short - u have error in this line:
JOIN products_to_fields_values pfv ON ( pfv.field_value_id = fvt.id )
right one:
JOIN products_to_fields_values pfv ON ( pfv.field_value_id = fvt.field_id )
I tried for your question, check this query
select fValue.field_id, f.field_name as field_name, fValue.field_value, fValue.id as field_value_id
from products_to_fields_values as productValue
left join fields_values as fValue on(fValue.field_id=productValue.field_value_id)
left join fields as f on (fValue.field_id=f.id)
left join products as p on (productValue.product_id=p.id)
where p.cid=1
I am quite sure the problem, i.e. the 'missing' records, is being caused by the 'group by' commands. It's a bit difficult to come up with a solution for you as I am not too sure what you are trying to achieve. The expected result you posted hasn't helped me much in this regard. The query you are trying to run is rather complex, and on a populated database is going to start running very, very slowly. As such it would suggest a better database design is required. If you can explain what you are trying to achieve I will gladly look at a solution for you.
Ignoring the limit and where clauses this is the query you need to use:
SELECT
fields.id AS field_id
, fields.field_name
, fields_values.field_value
, fields_values.id AS field_value_id
, COUNT(products.id) AS `count`
FROM fields_values
JOIN fields ON fields.id = fields_values.field_id
JOIN category AS field_category ON field_category.id = fields.cid
LEFT JOIN products_to_fields_values AS product_fields ON fields_values.id = product_fields.field_value_id
LEFT JOIN products ON products.id = product_fields.product_id
GROUP BY 1, 2, 3, 4;
This produces the following result:
| field_id | field_name | field_value | field_value_id | count |
+----------+------------+-----------------+----------------+-------+
| 1 | Processor | AMD Radeon | 4 | 0 |
| 1 | Processor | Intel Atom | 5 | 1 |
| 1 | Processor | Intel Pentium 3 | 1 | 1 |
| 2 | Display | 22 inch | 6 | 0 |
| 2 | Display | 27 inch | 2 | 1 |
| 3 | Brand | BMX | 3 | 1 |
In your where clause you can specify
WHERE category.id IN (1)
to get the result you want.
The mistake you were making (and a previous answer as well) was that you were joining the category through the product giving you the product_category instead of the field_category.
When you applied a where condition on the product_category, it removed all products not part of the set, so you would never get the count = 0
Hello everyone today i got in to a problem..
first thing i have a two table each table i have "product_seq_id" column and i joined table using the same "product_seq_id"
in the second table there are multiple rows for "product_seq_id" i want only one with below condition
table2.date_start not be null
table2.date_start is equal to '0000-00-00' or table2.date_start <= CURDATE()
table2.date_end is equal to '0000-00-00' or table2.date_start >= CURDATE()
get highest table2.priority if 2 or more rows match on the same day
I have already did some work.. but the problem is in that it's not taking highest priority number while ordering the column with grouped
//My Query
SELECT
psp . *, pcp . *
FROM
sk_product_category_path pcp
left join
sk_product_special_price psp ON (psp.product_seq_id = pcp.product_seq_id)
where
pcp.category_seq_id = 146
AND psp.product_seq_id IS NOT NULL
AND CASE
WHEN
psp.date_start IS NOT NULL
THEN
(psp.date_start = '0000-00-00'
OR psp.date_start <= CURDATE())
AND (psp.date_end = '0000-00-00'
OR psp.date_end >= CURDATE())
ELSE 1 = 1
END
group by psp.product_seq_id
order by psp.priority desc
Result Came for above code:
# product_special_price_seq_id, product_special_price, date_start, date_end, priority, product_seq_id, product_category_path_seq_id, product_seq_id, category_seq_id
2309 123123 0000-00-00 0000-00-00 0 3196 1 3196 146
2307 12313 0000-00-00 0000-00-00 0 3197 3 3197 146
Result I wanted:
# product_special_price_seq_id, product_special_price, date_start, date_end, priority, product_seq_id, product_category_path_seq_id, product_seq_id, category_seq_id
2309 12200 0000-00-00 0000-00-00 1 3196 2 3196 146
2307 12313 0000-00-00 0000-00-00 0 3197 3 3197 146
// Table Data
CREATE TABLE IF NOT EXISTS `sk_product_category_path` (
`product_category_path_seq_id` int(11) NOT NULL AUTO_INCREMENT,
`product_seq_id` int(11) NOT NULL,
`category_seq_id` int(11) NOT NULL,
PRIMARY KEY (`product_category_path_seq_id`),
UNIQUE KEY `product_seq_id` (`product_seq_id`,`category_seq_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
INSERT INTO `sk_product_category_path` (`product_category_path_seq_id`, `product_seq_id`, `category_seq_id`) VALUES
(1, 3196, 146),
(2, 3197, 146),
(3, 3198, 146);
CREATE TABLE IF NOT EXISTS `sk_product_special_price` (
`product_special_price_seq_id` int(11) NOT NULL AUTO_INCREMENT,
`product_special_price` bigint(20) DEFAULT NULL,
`date_start` date DEFAULT NULL,
`date_end` date DEFAULT NULL,
`priority` int(11) DEFAULT NULL,
`product_seq_id` int(11) NOT NULL,
PRIMARY KEY (`product_special_price_seq_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
INSERT INTO `sk_product_special_price` (`product_special_price_seq_id`, `product_special_price`, `date_start`, `date_end`, `priority`, `product_seq_id`) VALUES
(1, 12313, '0000-00-00', '0000-00-00', 0, 3197),
(2, 12200, '2014-02-11', '2014-02-11', 1, 3197),
(3, 123123, '0000-00-00', '0000-00-00', 0, 3196);
During GROUP BY in MySQL, it picks first matching row for each group unless you are using an aggregate function. The first matching need not be always row with min(id) .
The possible query should be something like :
SELECT t.*
from table_name t
inner join (
select min(id) as id
from table_name t
group by col) as s
on s.id = t.id
Please find the below query.. let me know is this is your requirement?
SELECT *
FROM sk_product_special_price pspo
WHERE pspo.priority IN(SELECT MAX(psp.priority)
FROM sk_product_special_price psp
JOIN sk_product_category_path pcp
ON(pcp.product_seq_id=psp.product_seq_id)
WHERE psp.date_start IS NOT NULL
AND psp.date_start BETWEEN '0000-00-00' AND CURDATE()
AND (psp.date_end>=CURDATE() OR psp.date_end='0000-00-00')
AND pcp.product_seq_id=pspo.product_seq_id);
I have updated the end date "'2014-02-11" to "2014-02-12" for my code to fetch end date >=today's date.
this query will return the table2 details i.e table sk_product_special_price for each all the product based on the priyority values.
the output will be
product_special_price_seq_id, product_special_price, date_start, date_end, priority, product_seq_id
2, 12200, '2014-02-11', '2014-02-12', 1, 3197
3, 123123, '0000-00-00', '0000-00-00', 0, 3196