How can I return a default values if no rows returned

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Hi,
Please i dont now how to return default values when no rows returned,

i tried COALESCE((),()) but coalesce should contain 1 column

for example i want to return manu column like : (select '12-12-12',312,1)

What I have tried:

SQL

SELECT COALESCE( (select CIN from Pers where Id=32323) ,(select '12-12-12',312,'zfsdf'))

Posted 23-Jan-18 11:34am

Member 13559666

Updated 4-Feb-18 9:24am

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Rajesh Pandya 24-Jan-18 8:25am

Store the coalesce function value in variable and check if value is blank or null then assign the default value in the variable.

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Maciej Los · Accepted Answer · 2018-02-04T09:22:00

Solution 1

You can use IF ... ELSE ... END IF
See: MySQL :: MySQL 5.7 Reference Manual :: 13.6.5.2 IF Syntax[^]

Another way is to use UNION + LIMIT:

SQL

(select Col1, Col2, Col3 FROM Pers WHERE Id=32323)
UNION
(SELECT '12-12-12' AS Col1, 312 AS Col2, 'zfsdf' AS Col3)
LIMIT 1;

Posted 4-Feb-18 9:22am

Maciej Los