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MySQL statement to get min value with max ID


MySQL statement to get min value with max ID

By : Shivalaxmi Arumugham
Date : November 22 2020, 10:38 AM
it should still fix some issue as soon as id unique - there is only one price for one id, no any "minimum" or "maximum", just one:
code :
select * from table where id in (
SELECT max(id)
FROM table as a
where a.price = (select min(price) from table as b where a.type=b.type)
group by type
) as t


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Enquiry Form in MYSQL. IF statement within a mysql select statement, if field is empty, left join to get the replacement

Enquiry Form in MYSQL. IF statement within a mysql select statement, if field is empty, left join to get the replacement


By : Jenny Zhang
Date : March 29 2020, 07:55 AM
hop of those help? I have a mysql problem , Use ISNULL function.
code :
SELECT ISNULL((SELECT name FROM a_table WHERE user_id = @usr),
       (SELECT name FROM i_user WHERE user_id = @usr)) AS name,
       ISNULL((SELECT [address] FROM a_table WHERE user_id = @usr),
       (SELECT [address] FROM i_user WHERE user_id = @usr)) AS a_address
FROM DUAL
SELECT ISNULL(t1.name, t2.name) AS name,
       ISNULL(t1.address, t2.address) AS a_address
FROM a_table t1
       LEFT JOIN i_user t2 ON t1.user_id = t2.user_id
WHERE t1.user_id = @usr
MySQL - UPDATE query with SET statement dependent on the outcome of the previous SET statement

MySQL - UPDATE query with SET statement dependent on the outcome of the previous SET statement


By : Luis Islas
Date : March 29 2020, 07:55 AM
Hope this helps Here is a tabular representation of what I would like to achieve with an UPDATE statement. , Just do the calculations independently:
code :
update [EXAMPLE]
set [Calc A] = A - B,
    [Calc B] = (A - B) / D,
    [Calc C] = B / ((A - B) / D)
MySQL + PHP In MySQL IF statement is wrong? How to create simple If statement MySQL 5.50?

MySQL + PHP In MySQL IF statement is wrong? How to create simple If statement MySQL 5.50?


By : frank100
Date : March 29 2020, 07:55 AM
Hope that helps MySQL IF() takes three expressions and if the first expression is true, not zero and not NULL, it returns the second expression. Otherwise, it returns the third expression.
Depending on the context in which it is used, it returns either numeric or string value.
code :
 IF(expression ,expr_true, expr_false);
SELECT IF(1>3,'true','false'); 
#return false
 SELECT  CASE WHEN 2 > 1 THEN 'HELLO WORLD'  END
MySQL: How can where clause be invalid for delete statement but work fine for select statement?

MySQL: How can where clause be invalid for delete statement but work fine for select statement?


By : Sermac
Date : March 29 2020, 07:55 AM
seems to work fine MySQL does not allow you to use the table being deleted (or updated) in the rest of the query. The normal solution is to use joins:
code :
delete tr
from timeclock_raw tr join
     (select tr1.env, tr1.intid, tr1.studycode, tr1.recdate, min(tr1.seconds) as minsecs, max(tr1.seconds) as maxsecs
      from timeclock_raw tr1
      group by tr1.env, tr1.intid, tr1.studycode, tr1.recdate
     ) x
     on tr1.env = tr.env and
        tr1.intid = tr.intid and
        tr1.studycode = tr.studycode and
        tr1.recdate = tr.recdate
where tr.rectype = 'active' and
      tr.recdate > '2018-08-17' and
      tr.seconds < x.maxsecs and
      tr.seconds > x.minsecs;
Is it possible through SQL injection to launch an UPDATE/DELETE statement from an INSERT/SELECT statement in MySQL?

Is it possible through SQL injection to launch an UPDATE/DELETE statement from an INSERT/SELECT statement in MySQL?


By : user3853942
Date : October 28 2020, 04:55 PM
may help you . Let's take the following vulnerable query ($id not being escaped): , Depending on the driver this may pass:
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