I currently have a table with columns for "field_type" (username, city, state), "user_id", and "value". The user_id column obviously has lots of repeats. I'd like to merge the city and state data into a single "location" field_type value. I need something that will:
for every integer in the user_id column:
-check if there exist corresponding (not null) table rows for field_type "city" and "state"
-if yes, insert a new row into the table with field_type "location" which concatenates the corresponding city and state values for that user_id
I haven't worked with MySQL much so I don't really know where to start. I've tried to simplify the problem a bit - it's actually a somewhat more complicated wordpress table and I'm trying to reformat the data to be compatible with a new plugin, but this covers the basics of what has to happen so I should hopefully be able to extrapolate an actual solution from the answers. Thanks for any pointers!
Edit: Current structure looks like this:
|-id (key)-|- field_type -|- user_id -|- value -|
| 1 | username | 1 | Joe |
| 2 | city | 1 | Albany |
| 3 | state | 1 | NY |
| 4 | username | 2 | Bob |
| 5 | city | 2 | Toledo |
| 6 | state | 2 | OH |
And I would like to get something like this:
|-id (key)-|- field_type -|- user_id -|- value ---------|
| 1 | username | 1 | Joe |
| 2 | city | 1 | Albany |
| 3 | state | 1 | NY |
| 4 | username | 2 | Bob |
| 5 | city | 2 | Toledo |
| 6 | state | 2 | OH |
| 7 | location | 1 | Albany, NY |
| 8 | location | 2 | Toledo, OH |
Duplicate user_id values are how it's supposed to work, so they don't need to be removed.
You could use an INSERT ... SELECT query to do this:
INSERT INTO yourtable
SELECT 'location' AS field_type, t1.user_id, CONCAT(t1.value, ' ', t2.value) AS value
FROM yourtable t1
JOIN yourtable t2 ON t2.user_id = t1.user_id AND t1.field_type = 'city' AND t2.field_type = 'state'
WHERE t1.value IS NOT NULL AND t2.value IS NOT NULL
Demo on dbfiddle
Since you are mentioned that there are duplicates with the same user_id.
I don't think inserting a new row will be a good idea.
So have written an update query to update the existing data.
You can later cleanup the duplciates.
UPDATE your_table SET locations = CONCAT_WS('-', state, city) where city is not null or state is not null
Related
So here is my problem, how can i do this :
user with ID = 7 from table A with 3 columns want to insert data to table B with 4 columns but with the same id.
Table A :
| Id | name | password |
| 7 | john | password |
| 9 | mark | password |
| 12 | yuta | password |
Table B :
| Id | user_id | food | drink |
| 1 | 7 | oats | milk |
| 2 | 9 | fish | water |
| 3 | 12 | pear | fanta |
How can i achieve table b in 1 query? both id in both table are primary keys and im using mysql
here's the code i was trying to do :
INSERT INTO table_b SET food = :food, drink = :drink, ( user_id) SELECT a.id FROM table_a u WHERE EXISTS (SELECT * WHERE name = :name AND password = :password)
i know the query is wrong but thats the closest i can do. pls help thank you
You should just use a unique code to link them together.
you can have the code stored in a variable like this
$unique = time().rand(1000, 9999);
//You should have something like this 16659154332358
Create a column that will recieve this value in your database.
Now they have a relationship
I have two tables in a MySQL database like this:
User:
userid |userid | Username | Plan(VARCHAR) | Status |
-----------+------------+--------------+---------------+---------+
1 | 1 | John | 1,2,3 |1 |
2 | 2 | Cynthia | 1,2 |1 |
3 | 3 | Charles | 2,3,4 |1 |
Plan: (planid is primary key)
planid(INT) | Plan_Name | Cost | status |
-------------+----------------+----------+--------------+
1 | Tamil Pack | 100 | ACTIVE |
2 | English Pack | 100 | ACTIVE |
3 | SportsPack | 100 | ACTIVE |
4 | KidsPack | 100 | ACTIVE |
OUTPUT
id |userid | Username | Plan | Planname |
---+-------+----------+------------+-------------------------------------+
1 | 1 | John | 1,2,3 |Tamil Pack,English Pack,SportsPack |
2 | 2 | Cynthia | 1,2 |Tamil Pack,English Pack |
3 | 3 | Charles | 2,3,4 |English Pack,Sportspack, Kidspack |
Since plan id in Plan table is integer and the user can hold many plans, its stored as comma separated as varchar, so when i try with IN condition its not working.
SELECT * FROM plan WHERE find_in_set(plan_id,(select user.planid from user where user.userid=1))
This get me the 3 rows from plan table but i want the desired output as above.
How to do that.? any help Please
A rewrite off your query what should work is as follows..
Query
SELECT
all columns you need
, GROUP_CONCAT(Plan.Plan_Name ORDER BY Plan.planid) AS Planname
FROM
Plan
WHERE
FIND_IN_SET(Plan.plan_id,(
SELECT
User.Plan
FROM
user
WHERE User.userid = 1
)
)
GROUP BY
all columns what are in the select (NOT the GROUP_CONCAT function)
You also can use FIND_IN_SET on the ON clause off a INNER JOIN.
One problem is that the join won't ever use indexes.
Query
SELECT
all columns you need
, GROUP_CONCAT(Plan.Plan_Name ORDER BY Plan.planid) AS Planname
FROM
User
INNER JOIN
Plan
ON
FIND_IN_SET(Plan.id, User.Plan)
WHERE
User.id = 1
GROUP BY
all columns what are in the select (NOT the GROUP_CONCAT function)
Like i said in the comments you should normalize the table structures and add the table User_Plan whats holds the relations between the table User and Plan.
Given the following table:
+--------+-------------------+-----------+
| ID | Name | Priority |
+--------+-------------------+-----------+
| 1 | Andy | 1 |
| 2 | Bob | 2 |
| 3 | David | 8 |
| 4 | Edward | 9 |
| 5 | CHARLES | 15 |
+--------+-------------------+-----------+
I would like to move CHARLES to between Bob and David by Priority value (ignore the alphabetical list, this is just to make the desired result obvious).
(Also note the Priority values may not be sequential)
To do this I need to change CHARLES' current Priority (15) to Bob's Priority+1, and update David and Edward's Priority to Priority+1.
I can DO this if I know two things, the id of CHARLES and the Priority value of the row he must be after (Bob):
UPDATE mytable SET Priority =
IF(ID = :charles_id, :bob_priority + 1,
IF(Priority >= :bob_priority,
Priority + 1, Priority))
The PROBLEM or at least question is, how could I compress the resulting values to 1,2,3,4,5 instead of 1,2,3,9,10 - and do it in one shot?
Oracle has a "pseudo field" which is the index of the row, but I don't know of anything equivalent in MySQL.
The first part of the problem is fairly trivial...
DROP TABLE IF EXISTS priorities;
CREATE TABLE priorities
(ID SERIAL PRIMARY KEY
,Name VARCHAR(12) NOT NULL
,Priority INT NOT NULL
,INDEX(priority)
);
INSERT INTO priorities VALUES
(101,'Andy',1),
(108,'Bob',2),
(113,'David',8),
(124,'Edward',9),
(155,'CHARLES',15);
UPDATE priorities a
JOIN
( SELECT x.id,x.name, #i:=#i+1 priority FROM priorities x, (SELECT #i:=0) vars ORDER BY id) b
ON b.id = a.id
SET a.priority = b.priority;
SELECT * FROM priorities
+-----+---------+----------+
| ID | Name | Priority |
+-----+---------+----------+
| 101 | Andy | 1 |
| 108 | Bob | 2 |
| 113 | David | 3 |
| 124 | Edward | 4 |
| 155 | CHARLES | 5 |
+-----+---------+----------+
+----+------------+------------+------------+----------+
| id | phone_no | join_date | city | blood_gp |
+----+------------+------------+------------+----------+
| 1 | 80077672xx | 1997-07-19 | Delhi | NULL |
| 2 | 80077642xx | 1998-07-19 | New Delhi | NULL |
| 3 | 80477642xx | 1999-07-19 | Mumbai | NULL |
| 4 | 80077654xx | 1997-05-31 | Kolkata | NULL |
+----+------------+------------+------------+----------+
I want to enter all the blood groups at once . Is there a way to do so ?
you can use single query with select and update
UPDATE table1 , (SELECT * FROM table2 where 1) src
SET table1.blood_gp = src.filed2 where 1 ;
if you want to insert multiple row data using single query then use this code
INSERT INTO yourtable (x,y,z) VALUES (a1,a2,a3), (b1,b2,b3);
or if you want to update one column value all filed then use this code
update yourtable set blood_gp = 'yourvalue' where 1;
if any problem then inform me
Just make an update query without where clause.
update table set blood_gp = 'value'
That's generalize query.
I want to merge two rows into one.The below format is in the database.
+----+---------+-----------------------+-------------------------+
| id | appid | photo | signature |
+====+=========+=======================+=========================+
| 1 | 10001 | 10001.photograph.jpg | NULL |
| 2 | 10001 | NULL | 10001.signature.jpg |
+----+---------+-----------------------+-------------------------+
I want a mysql query so that i can fetch data like below,
+--------+------------------------+-------------------------+
| appid | photo | signature |
+========+========================+=========================+
|10001 | 10001.photograph.jpg | 10001.signature.jpg |
+--------+------------------------+-------------------------+
Kindly suggest...
You can also use max function
select appid,
max(photo) photo,
max(signature) signature
from test
group by appid
Demo
This should do this:
select t1.appid,t1.photo,t2.signature from mytable t1 join mytable t2 on t1.appid=t2.appid where t1.id=1 and t2.id=2