I'm coding a website for a photographer and I'm currently working on gallery implimentation.
I need to be able to take a row from point n.a and move it to point n.b
Here's an example of the raw table:
|gallery_img |
|--------------------------|
| id | fk_gal | fk_img | o |
| | | | |
| 0 | 16 | 240 | 1 |
| 1 | 16 | 322 | 2 |
| 2 | 27 | 240 | 1 |
| 3 | 16 | 245 | 3 |
| 4 | 16 | 210 | 4 |
| 5 | 27 | 530 | 2 |
All fields are INT(11). 'id' Auto_increments. 'fk_gal' and 'fk_img' are linked to other, irrelevant, tables via FOREIGN_KEY.
Now, 'o' is the field I'm focusing on. It determines what order the images will be displayed on the website. This value needs to always be unique for each table. To clarify, If I only call one table, 'o' should be different in every row. However, if I call the entire table, 'o[0]' might reoccur a few times.
So here's what I need. Firstly, I'm only going to be running this function on only one gallery at a time so all visuals of the table from here on out are going to be filtered with 'SELECT * FROM gallery_img WHERE fk_gal = 16'.
I need to change 'o' from n to n2 which will effectively move it on the database.
|gallery_img |
|--------------------------|
| id | fk_gal | fk_img | o |
| | | | |
| 0 | 16 | 240 | 1 |
| | | | | <--
| 1 | 16 | 322 | 2 |+ |
| 3 | 16 | 245 | 3 |+ |
| 4 | 16 | 210 | 4 | --|
The code needs to move the desired row (in this example 'o=4') to 1 and simultaneously move all of the next rows down to prevent any reoccurrences.
Here's my code I have right now. I'm coding my MySql scripts via PHP.
I am using the $n variable here. It includes the following data:
$n = array(gallery_id,img_id,target_o);
sql("UPDATE gallery_img SET o = o + 1 ORDER BY o ASC LIMIT ". ($n[2] - 1) .", 18446744073709551615;");
sql("UPDATE gallery_img SET o = ". ($n[2] + 2) ." WHERE fk_img = $n[1] AND fk_gal = $n[0];");
The problem I'm having with this is that when I execute it I get one of these two outputs:
|gallery_img |
|--------------------------|
| id | fk_gal | fk_img | o |
| | | | |
| 0 | 16 | 240 | 1 |
| 4 | 16 | 210 | 1 | <-- Shouldn't be duplicate
| 1 | 16 | 322 | 2 |
| 3 | 16 | 245 | 3 |
|gallery_img |
|--------------------------|
| id | fk_gal | fk_img | o |
| | | | |
| 0 | 16 | 240 | 1 |
| 4 | 16 | 210 | 2 |
| 1 | 16 | 322 | 4 |-|
| 3 | 16 | 245 | 4 | |-- Shouldn't be duplicate
| 5 | 16 | 273 | 4 | |
| 6 | 16 | 14 | 4 |-|
A good way to think of it is as so:
UPDATE
If you have any questions please let me know!
Thanks ahead of time for your help!
So if you're wanting to change the row WHERE o=4 to o=1 then increment the number to be replaced and all greater numbers.
UPDATE gallery_img SET o = (o + 1) WHERE o >= 1
Then update the row that you want to be o=1:
UPDATE gallery_img SET o = 1 WHERE fk_img = something1 AND fk_gal = something2
Or if you only know the o use o=(4+1) since it changed in the last UPDATE:
UPDATE gallery_img SET o = 1 WHERE o = 5
Can I suggest a hack? For the column o don't use an integer number, but a DOUBLE PRECISION one.
It would be much easier to insert a row in between, just by averaging the values of the previous and next row. If you need to insert between 3 and 4, you can just insert a row with 3.5.
Of course, after some time (after 50 times at least) you would like to re-number those values, since a DOUBLE PRECISION has 53 bits for the mantissa.
Related
I have a mySQL database table containing cellphones information like this:
ID Brand Model Price Type Size
==== ===== ===== ===== ====== ====
1 Apple A71 3128 A 40
2 Samsung B7C 3128 B 20
3 Apple ZX5 3128 A 30
4 Huawei Q32 2574 B 40
5 Apple A21 2574 A 25
6 Apple A71 3369 A 30
7 Samsung A71 7413 C 40
Now I want to create another table, that would contain counts for every possible combination of the parameters.
Params Count
============================================== =======
ALL 1000000
Brand(Apple) 20000
Brand(Apple,Samsung) 40000
Brand(Apple),Model(A71) 7100
Brand(Apple),Type(A) 6000
Brand(Apple),Model(A71,B7C),Type(A,B) 7
Model(A71) 12514
Model(A71,B7C) 26584
Model(A71),Type(A) 6521
Model(A71),Type(A,B) 8958
Model(A71),Type(A,B),Size(40) 85
And so on for every possible combination. I was thinking about creating a stored procedure (that i would execute periodically), that would perform queries with every existing condition like that, but I am a little stuck on how exactly should it look like. Or is there a better way how to do this?
Edit: the reason why I want to store information like this is to be able to show number of results in filter in client application, like in the picture.
I would like to create index on the Params column to be able to get the Count number for given hash instantly, improving performance.
I also tried querying and caching the values dynamically, but I want to try this approach as well, so I can compare which one is more effective.
This is how I am calculating the counts now:
SELECT COUNT(*) FROM products;
SELECT COUNT(*) FROM products WHERE Brand IN ('Apple');
SELECT COUNT(*) FROM products WHERE Brand IN ('Apple', 'Samsung');
SELECT COUNT(*) FROM products WHERE Brand IN ('Apple') AND Model IN ('A71');
etc.
You can use a ROLLUP for this.
SELECT
model, type, size, COUNT(*)
FROM mytab
GROUP BY 1, 2, 3
WITH ROLLUP
With your sample data, we get the following:
| model | type | size | COUNT(*) |
| ----- | ---- | ---- | -------- |
| A21 | A | 25 | 1 |
| A21 | A | | 1 |
| A21 | | | 1 |
| A71 | A | 30 | 1 |
| A71 | A | 40 | 1 |
| A71 | A | | 2 |
| A71 | C | 40 | 1 |
| A71 | C | | 1 |
| A71 | | | 3 |
| B7C | B | 20 | 1 |
| B7C | B | | 1 |
| B7C | | | 1 |
| Q32 | B | 40 | 1 |
| Q32 | B | | 1 |
| Q32 | | | 1 |
| ZX5 | A | 30 | 1 |
| ZX5 | A | | 1 |
| ZX5 | | | 1 |
| | | | 7 |
The subtotals are present in the rows with null values in different columns, and the total is the last row where all group by columns are null.
I have the following table, let's call it Segments:
-------------------------------------
| SegmentStart | SegmentEnd | Value |
-------------------------------------
| 1 | 4 | 20 |
| 4 | 8 | 60 |
| 8 | 10 | 20 |
| 10 | 1000000 | 0 |
-------------------------------------
I am trying to join this table with itself, to obtain the following result set:
-------------------------------------
| SegmentStart | SegmentEnd | Value |
-------------------------------------
| 1 | 4 | 20 |
| 1 | 8 | 60 |
| 1 | 10 | 60 |
| 1 | 1000000 | 60 |
| 4 | 8 | 60 |
| 4 | 10 | 60 |
| 4 | 1000000 | 60 |
| 8 | 10 | 20 |
| 8 | 1000000 | 20 |
| 10 | 1000000 | 0 |
-------------------------------------
Basically, I would need to join every row, with every other row that comes after it, then get the MAX() of the value between each of the rows joined previously. Example: if I am joining row 1 with row 3, I would need the MAX(Value) from all of these 3 rows.
What I already done is the following query:
SELECT s1.SegmentStart, s2.SegmentEnd, GREATEST(s1.Value, s2.Value) as Value FROM Segments s1 CROSS JOIN Segments s2 ON s1.SegmentStart < s2.SegmentEnd
This query creates a similar table to the one desired, but the value fields get mixed up in the following way (I've marked between !! the row that differs):
-------------------------------------
| SegmentStart | SegmentEnd | Value |
-------------------------------------
| 1 | 4 | 20 |
| 1 | 8 | 60 |
| 1 | 10 | !20! |
| 1 | 1000000 | !20! |
| 4 | 8 | 60 |
| 4 | 10 | 60 |
| 4 | 1000000 | 60 |
| 8 | 10 | 20 |
| 8 | 1000000 | 20 |
| 10 | 1000000 | 0 |
-------------------------------------
The problem is with the GREATEST() function, because it only compares the two rows that are being joined (start-end 1-4, 8-10), and not the whole interval (in this case, it would be 3 rows, the ones with start-end 1-4, 4-8, 8-10)
How should I modify this query, or what query should I use, to get my desired result?
Additional info, that may help: the rows in the original table, are always ordered based on SegmentStart, and there can be no duplicate or missing values. Every interval between x and y will appear only once in the table, with no overlaps, and no gaps at all.
I am using Maria DB 10.3.13.
Something like this?
SELECT
s1.SegmentStart
, s2.SegmentEnd
, MAX(s.Value) as Value
FROM
Segments s1
INNER JOIN Segments s2 ON (
s2.SegmentEnd > s1.SegmentStart
)
INNER JOIN Segments s ON (
s.SegmentStart >= s1.SegmentStart
AND s.SegmentEnd <= s2.SegmentEnd
)
GROUP BY
s1.SegmentStart
, s2.SegmentEnd
I have MySQL table in the following format. This is an output from a program that I run and I cannot change it.
+---+------------------------+
| | A B C D E |
+---+------------------------+
| | model amz wmt abt tgt |
| 1 | c3000 100 |
| 2 | c3000 200 |
| 3 | c3000 150 |
| 4 | c3000 125 |
| 5 | A1234 135 |
| 6 | A1234 105 |
+---+------------------------+
I want to move all the rows into one single row based on the value in column 1 i.e model. The caveat is that the blank rows are not actually blank and contain a null character
DESIRED OUTPUT:
+---+-----------------------+
| | A B C D E |
+---+-----------------------+
| | model amz wmt abt tgt |
| 1 | c3000 100 200 150 125 |
| 2 | A1234 200 105 135 |
+---+-----------------------+
I tried using
select model,group_concat(wmt),group_concat(amz)
from table_name
group by model
And the output that I get is riddled with commas
+---+----------------------------------+
| | A B |
+---+----------------------------------+
| | model amz wmt |
| 1 | c3000 ,,,,100,,,, ,,,200,,,, |
| 2 | A1234 ,,200,,,,,, ,105,,,,,, |
+---+----------------------------------+
You can use TRIM and IF to convert blank values to null.
SELECT
model,
GROUP_CONCAT(IF(TRIM(wmt) = '', NULL, wmt)),
GROUP_CONCAT(IF(TRIM(amz) = '', NULL, amz))
FROM
table_name
GROUP BY model
SELECT
model,
MIN(amz) AS amz,
MIN(wmt) AS wmt,
MIN(abt) AS abt,
MIN(tgt) AS tgt
FROM
table_name
GROUP BY
model
Working in Redmine, I need to copy(not move) data from certain rows to other rows based on matching project id numbers with time entries.
I have included a diagram of the table "custom_values" and my understanding of the design below(CURRENT DATA):
+----+-----------------+---------------+-----------------+-------+
| id | customized_type | customized_id | custom_field_id | value |
+----+-----------------+---------------+-----------------+-------+
| 1 | Project | 1 | 1 | 01 |
| 2 | TimeEntry | 1 | 4 | 01 |
| 3 | Project | 2 | 1 | 02 |
| 4 | TimeEntry | 2 | 4 | 02 |
| 5 | Project | 3 | 1 | 03 |
| 6 | TimeEntry | 3 | 4 | |
| 7 | Project | 4 | 1 | 04 |
| 8 | TimeEntry | 4 | 4 | |
+----+-----------------+---------------+-----------------+-------+
At the risk of oversimplifying,
"id" = The primary key for each entry in custom_values
"customized_type" = Specifies which db table the row is referring to.
"customized_id" = Specifies the primary key for the db table entry previously specified in "customized_type".
"custom_field_id" = Specifies which custom field the row is referring to. Redmine admins can arbitrarily add and remove custom fields.
"value" = The data contained within the custom field specified by
"custom_field_id"
In my situation, the values listed in "value" are representing unique customer id numbers. The customer id numbers did not always get entered with each time entry. I need to copy the customer numbers from the project rows to the matching time entry rows. Each time entry has a project_id field.
So far, here is my mangled SQL query:
SELECT
custom_field_id,
custom_values.value AS 'CUSTOMER_NUMBER',
custom_values.customized_id AS 'PROJECT_ID_NUMBER',
custom_values.customized_type,
time_entries.comments AS 'TIME_ENTRY_COMMENTS'
FROM
redmine_tweaking.custom_values
LEFT JOIN
redmine_tweaking.time_entries ON custom_values.customized_id = time_entries.project_id
WHERE
custom_values.customized_type='Project' AND custom_values.custom_field_id=1;
The query I have so far allows me to see that I have the time entries connected properly to their matching projects, but that is all I have been able to figure out. So in other words, this SQL statement does not exactly solve my problem.
Plus, even if it did work, I think the way I laid it out looks like 200 lbs of bird poop. There must be a better/more optimized way to do this.
Any help would be greatly appreciated. I am relatively new and I have been pouring hours into solving this problem.
UPDATE:
Ok, here is the time_entries table:
+----+------------+---------+----------+-------+----------+-------------+------------+-------+--------+-------+---------------------+---------------------+
| id | project_id | user_id | issue_id | hours | comments | activity_id | spent_on | tyear | tmonth | tweek | created_on | updated_on |
+----+------------+---------+----------+-------+----------+-------------+------------+-------+--------+-------+---------------------+---------------------+
| 1 | 1 | 1 | 1 | .25 | test | 9 | 2015-11-04 | 2015 | 11 | 45 | 2015-11-04 08:18:12 | 2015-11-04 10:18:12 |
| 2 | 2 | 1 | 1 | .25 | test2 | 9 | 2015-11-04 | 2015 | 11 | 45 | 2015-11-04 09:18:12 | 2015-11-04 12:18:12 |
+----+------------+---------+----------+-------+----------+-------------+------------+-------+--------+-------+---------------------+---------------------+
As opposed to the original table that I first posted, the expected output would show this:
+----+-----------------+---------------+-----------------+-------+
| id | customized_type | customized_id | custom_field_id | value |
+----+-----------------+---------------+-----------------+-------+
| 1 | Project | 1 | 1 | 01 |
| 2 | TimeEntry | 1 | 4 | 01 |
| 3 | Project | 2 | 1 | 02 |
| 4 | TimeEntry | 2 | 4 | 02 |
| 5 | Project | 3 | 1 | 03 |
| 6 | TimeEntry | 3 | 4 | 03 |
| 7 | Project | 4 | 1 | 04 |
| 8 | TimeEntry | 4 | 4 | 04 |
+----+-----------------+---------------+-----------------+-------+
i want to COUNT column less than with other column which if Quantity in Hand < Minimum Quantity and i should get the result = 5
Instead, i got the result = 3.
| stock_id | stock_qtyhand | stock_minQty |
| 1 | 60 | 100 |
| 2 | 29 | 58 |
| 3 | 12 | 20 |
| 4 | 5 | 35 |
| 5 | 30 | 67 |
What seems to be the problem?
rsLowStock.Open "SELECT COUNT(stock_id) AS LowStock FROM stock_general WHERE stock_qtyhand<stock_minQty",conn
I appreciate your help