I read a number of posts and replies about this error, but all the replies give specific answers to the specific question. Can someone explain what the issue is, and how to overcome it in general, so that I don't have to post every problem query here.
This is the code for my procedure
CREATE PROCEDURE `sp_FixEntityNames`(IN `importId` BIGINT UNSIGNED)
BEGIN
UPDATE ImportedSymbols s
JOIN ExchangeMappings m ON s.ExchangeMappingId = m.ExchangeMappingId
SET s.EntityName =
(
SELECT s1.EntityName
FROM ImportedSymbols s1
JOIN ExchangeMappings m1 ON s1.ExchangeMappingId = m1.ExchangeMappingId
WHERE
s1.ImportId = importId
AND
s1.Symbol = s.Symbol
AND
s1.Suffix = NULL
AND
s1.MarketId = NULL
AND
s1.SecurityTypeId = 1
AND
m1.NamespaceId = m.NamespaceId
)
WHERE
s.ImportId = importId
AND
(
s.Suffix != NULL
OR
s.MarketId != NULL
OR
s.SecurityTypeId != 1
);
END
The general explanation is that in MySQL, you can't modify the same table which you use in the SELECT part.
you can verify al this mysql Reference doc : http://dev.mysql.com/doc/refman/5.6/en/update.html
(four line before user comment you find )
You cannot update a table and select from the same table in a
subquery.
Related
I have read a bunch of ways that has gotten me this far. But I can't get to the finish line.
I have a table of coupon codes. I want to use one transaction to select the next available code, mark it as used and input the order number. I can get the update and nested select to work, but I cannot figure out how to actually return the coupon code from the select. It just returns 1 row updated.
Here's what I've got:
UPDATE `prcoupon` pr
SET
`pr`.`status` = '1',
`pr`.`invoicenumber` = '09990002'
WHERE
`pr`.`couponCode` = (SELECT
`prcoupon`.`couponcode`
FROM
`prcoupon`
WHERE
`status` = 0
LIMIT 1)
Sample data
What I need returned is: couponCode: SL2T-03A0-JVCY-W2XMXG
If I understand correctly, you can try to use UPDATE ... JOIN with ROW_Nunber windwon function.
UPDATE prcoupon pr
JOIN (
SELECT *,ROW_NUMBER() OVER(ORDER BY couponCode) rn
FROM prcoupon
WHERE status = 0
) t2 ON pr.couponcode = t2.couponcode
SET pr.status = 1,
pr.invoicenumber = '09990002'
WHERE rn = 1
sqlfiddle
DataBase_1 has a list of users with their vBulletinId
DataBase_2 has the vBulletin users with their vBulletinId and UserGroupId
I want to find all vBulletin users from Database_2, who are NOT in Database_1, and change their UserGroupId to 15
UPDATE database_2.user
SET
usergroupid = 15
WHERE
(
SELECT UserId
FROM database_2.user
WHERE UserId NOT IN
(
SELECT vBulletinId
FROM database_1.Users
)
);
Currently I am getting a "You can't specify target table 'user' for update in FROM clause"
Any help would be great. thanks.
=== SOLUTION ===
A simplified solution that worked.
UPDATE database_2.user
SET
usergroupid = 15
WHERE userid NOT IN
(
SELECT vBulletinId FROM database_1.Users
);
UPDATE database_2.user
LEFT JOIN database_1.Users ON database_2.user.UserId = database_1.Users.vBulletinId
SET database_2.user.usergroupid = 15
WHERE database_1.Users.vBulletinId IS NULL
or
UPDATE database_2.user
SET database_2.user.usergroupid = 15
WHERE NOT EXISTS ( SELECT NULL
FROM database_1.Users
WHERE database_2.user.UserId = database_1.Users.vBulletinId )
I am trying to figure out how to get all tasks in this case that two of the fields equal a certain value or they exist in the other table?
Here is the query:
SELECT TASKS.task_id, TASKS.task_title, TASKS.task_description, TASKS.task_assigned_name, TASKS.task_assigned_phone_number, TASKS.task_due_date_time, TASKS.task_category
FROM TASKS
WHERE TASKS.task_complete = 1 AND
(TASKS.task_creator_id = ? OR
TASKS.task_assigned_user_id = ? OR
WHERE EXISTS (SELECT WATCHERS.task_id
FROM WATCHERS
WHERE WATCHERS.task_id = TASK.task_id AND
WATCHERS.watcher_user_id = ?
)
);
This is not returning anything even though I am expecting a result from my db.
You seem to have an error in your syntax. You have too many WHEREs:
SELECT t.task_id, t.task_title, t.task_description, t.task_assigned_name, t.task_assigned_phone_number, t.task_due_date_time, t.task_category
FROM TASKS t
WHERE t.task_complete = 1 AND
(t.task_creator_id = ? OR
t.task_assigned_user_id = ? OR
EXISTS (SELECT 1 -- the return value is immaterial
FROM WATCHERS w
WHERE w.task_id = t.task_id AND
w.watcher_user_id = ?
)
);
The WHERE before EXISTS is not appropriate.
Your query should be returning an error. Be sure to check for errors!
Have you tried using a join?
SELECT TASKS.task_id,
TASKS.task_title,
TASKS.task_description,
TASKS.task_assigned_name,
TASKS.task_assigned_phone_number,
TASKS.task_due_date_time,
TASKS.task_category
FROM TASKS
JOIN WATCHERS on WATCHERS.task_id = TASK.task_id
WHERE TASKS.task_complete = 1 AND
(TASKS.task_creator_id = ? OR
TASKS.task_assigned_user_id = ? OR
WATCHERS.watcher_user_id = ?);
I'm not sure if that's the logic you are looking for.
besides the extra where in your query, looks like you may have an extra closed parenthesis.
This sql matches the result set you posted in your duplicate post that has sample data and result:
SELECT t.task_id, t.task_complete, t.task_creator_id, t.task_assigned_user_Id
FROM tasks t
WHERE t.task_complete = 1 AND
(
t.task_creator_id = 8
OR t.task_assigned_user_id = 8
OR EXISTS
(
SELECT w.task_id
FROM watchers w
WHERE w.task_id = t.task_id
AND w.watcher_user_id = 8
)
)
I am trying to figure out how to get all tasks in this case that two of the fields equal a certain value or they exist in the other table?
Here is the query:
SELECT TASKS.task_id, TASKS.task_title, TASKS.task_description, TASKS.task_assigned_name, TASKS.task_assigned_phone_number, TASKS.task_due_date_time, TASKS.task_category
FROM TASKS
WHERE TASKS.task_complete = 1 AND
(TASKS.task_creator_id = ? OR
TASKS.task_assigned_user_id = ? OR
WHERE EXISTS (SELECT WATCHERS.task_id
FROM WATCHERS
WHERE WATCHERS.task_id = TASK.task_id AND
WATCHERS.watcher_user_id = ?
)
);
This is not returning anything even though I am expecting a result from my db.
You seem to have an error in your syntax. You have too many WHEREs:
SELECT t.task_id, t.task_title, t.task_description, t.task_assigned_name, t.task_assigned_phone_number, t.task_due_date_time, t.task_category
FROM TASKS t
WHERE t.task_complete = 1 AND
(t.task_creator_id = ? OR
t.task_assigned_user_id = ? OR
EXISTS (SELECT 1 -- the return value is immaterial
FROM WATCHERS w
WHERE w.task_id = t.task_id AND
w.watcher_user_id = ?
)
);
The WHERE before EXISTS is not appropriate.
Your query should be returning an error. Be sure to check for errors!
Have you tried using a join?
SELECT TASKS.task_id,
TASKS.task_title,
TASKS.task_description,
TASKS.task_assigned_name,
TASKS.task_assigned_phone_number,
TASKS.task_due_date_time,
TASKS.task_category
FROM TASKS
JOIN WATCHERS on WATCHERS.task_id = TASK.task_id
WHERE TASKS.task_complete = 1 AND
(TASKS.task_creator_id = ? OR
TASKS.task_assigned_user_id = ? OR
WATCHERS.watcher_user_id = ?);
I'm not sure if that's the logic you are looking for.
besides the extra where in your query, looks like you may have an extra closed parenthesis.
This sql matches the result set you posted in your duplicate post that has sample data and result:
SELECT t.task_id, t.task_complete, t.task_creator_id, t.task_assigned_user_Id
FROM tasks t
WHERE t.task_complete = 1 AND
(
t.task_creator_id = 8
OR t.task_assigned_user_id = 8
OR EXISTS
(
SELECT w.task_id
FROM watchers w
WHERE w.task_id = t.task_id
AND w.watcher_user_id = 8
)
)
I need to re-write the following Oracle 10g query to work in SQL Server 2008
It's an update query, where some field are retrieved from a SELECT and some are given (from code).
UPDATE "BMAN_SQL"."CELLS_GLIST"
SET ("GLIST_ID", "GLIST_VALUE_ID") = (
SELECT "GLIST_ID", "GLIST_VAL_ID"
FROM "BMAN_SQL"."GLISTS_VAL_UOR"
WHERE ("UOR_ID"=3)
AND ("GLIST_CODE"='X')
),
"SESSION_ID" = 1553245736,
"USER_ID" = 13
WHERE EXISTS ( SELECT * FROM ... )
Note that I need to use the UPDATE SET ... WHERE EXIST ... structure for compatibility with Oracle (query are automatically built by a QueryBuilder class for each specific DBMS).
I also cannot write:
UPDATE "BMAN_SQL"."CELLS_GLIST"
SET ("GLIST_ID", "GLIST_VALUE_ID", "SESSION_ID", "USER_ID") = (
SELECT "GLIST_ID", "GLIST_VAL_ID", 1553245736, 13
FROM "BMAN_SQL"."GLISTS_VAL_UOR"
WHERE ("UOR_ID"=3)
AND ("GLIST_CODE"='X')
)
WHERE EXISTS ( SELECT * FROM ... )
because (as per this old thread Oracle "Cannot update to NULL") it returns an error if the SELECT does not fetch any record.
Thanks in advance!
You need to join update query in this case. Please see syntax below. <Your condition here> Replace this section with your join condition here.
UPDATE m
SET
GLIST_ID = r.GLIST_ID
,GLIST_VALUE_ID = r.GLIST_VAL_ID
, SESSION_ID= 1553245736
, USER_ID = 13
from BMAN_SQL.CELLS_GLIST m
inner join BMAN_SQL.GLISTS_VAL_UOR r on <Your condition here>
WHERE
r.UOR_ID=3 AND (r.GLIST_CODE='X') AND
EXISTS ( SELECT * FROM ... )
EDIT
UPDATE BMAN_SQL.CELLS_GLIST
SET
GLIST_ID = (SELECT TOP 1 GLIST_ID FROM BMAN_SQL.GLISTS_VAL_UOR WHERE (UOR_ID=3) AND (GLIST_CODE='X'))
,GLIST_VALUE_ID = (SELECT TOP 1 GLIST_VAL_ID FROM BMAN_SQL.GLISTS_VAL_UOR WHERE (UOR_ID=3) AND (GLIST_CODE='X'))
,SESSION_ID = 1553245736
,USER_ID = 13
WHERE EXISTS ( SELECT * FROM ... )