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i want to select two columns from database id and password
and want to use those two columns data in update query
example
select id , pass from table
second update query
update table set password2=password_get_from select_query where id=id_get_from_select_query
Try something like.
update table_one as A
inner join table_two AS B on (A.id = B.id)
set A.some_column = B.some_column,
A.another_column = B.another_column
where blah
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update A
set step1_response='step2',
step1_editor='step2'
where ch_idx in (select B.ch_idx
from B
where B.check_e_done_ct=B.check_e_tot_ct
AND B.check_w_tot_ct=B.check_w_done_ct);
The result of select inside the parentheses is about 4000 rows.
The table to be updated (A) is about 90000 rows.
the command above takes forever to complete.
how can i re-write this query to get result faster?
thank you!
UPDATE a
JOIN b USING (ch_idx)
SET a.step1_response='step2',
a.step1_editor='step2'
WHERE b.check_e_done_ct = b.check_e_tot_ct
AND b.check_w_tot_ct = b.check_w_done_ct;
or maybe
UPDATE a
JOIN ( SELECT ch_idx
FROM b
WHERE b.check_e_done_ct = b.check_e_tot_ct
AND b.check_w_tot_ct = b.check_w_done_ct ) bb USING (ch_idx)
SET a.step1_response='step2',
a.step1_editor='step2';
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I have 2 email tables. 1 = main email table, 2 = bounce_table.
Field email = unique in both tables.
Tasks = delete from main_email_table where email is in bounce_table.
I have no idea how to make the right call for action for this task.
I hope to get an idea how to solve this.
Thanks
check below query-
DELETE me.* FROM main_email AS me
JOIN bounce_email AS be ON me.email=be.email;
You need a DELETE with JOIN:
DELETE email_table
FROM email_table
INNER JOIN bounce_table ON bounce_table.email = email_table.email
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I have a question about MySQL: I want to list results from a table but gather additional information about these results from another table by a foreign key.
My table YTPrograms has a foreign key called Author which corresponds to the Id of a second table called YTUsers from which I want to add the username to my result from the YTPrograms query. I'm not sure how to do this without having to query (the users table) for each result.
Try this:
SELECT p.something, u.username FROM YTPrograms p, YTUsers u WHERE p.Author = u.Id
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How can I do this correctly?
INSERT INTO tbl_task (`Assignedby`,`userID`)
SELECT ID FROM tbl_users WHERE UserName='$_GET[u]',
SELECT ID FROM tbl_users WHERE UserName='$_GET[at]'
Assuming you want to insert one row with two columns, I think you might want this:
INSERT INTO tbl_task(`Assignedby`, `userID`)
SELECT (SELECT ID FROM tbl_users WHERE UserName='$_GET[u]'),
(SELECT ID FROM tbl_users WHERE UserName='$_GET[at]');
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I want to write a select stored procedure and in the where clause I want to check value of a field of the parent table of the curent table which I am performing the select query On , How can I acheive this ?
any helps would be appreciated
You'll nedd to JOIN those tables. Without knowing the tables definition, your query should look something like this:
SELECT C.* --- List the columns you want here
FROM ChildTable C
INNER JOIN ParentTable P
ON C.ParentID = P.ID --- something along this lines
WHERE P.SomeField = 1 --- put here your condition on the parent table