Is there any way to do that in a single query? Or do I have to manage it externally? It is not a JOIN of any kind.
SELECT
IF (
(SELECT indicator FROM configuration_table) = 1,
(SELECT series_id FROM series_table LIMIT 1),
''
) as if_exp
FROM
series_table
This executes but returns the first ID over and over, and if I take out the LIMIT 1, it doesn't work as it expects only one result. But what I need is that, if this condition is met:
(SELECT indicator FROM configuration_table) = 1,
Then I need all this data returned:
SELECT series_id, series_code, series_name FROM series_table
Is it possible somehow? Should I be doing two queries and managing the data from php? Thank you very much.
The easiest way would be:
IF ((SELECT indicator FROM configuration_table) = 1) THEN
SELECT series_id, series_code, series_name FROM series_table
END IF
You did not show us what to do, when the condition is false. We do not know the relationship between configuration_table
and series_table
, so we can't find a way to make it in a single query.
I have copied this answer from IF Condition Perform Query, Else Perform Other Query this answer.
SELECT CASE WHEN ( (SELECT indicator FROM configuration_table) = 1 )
THEN
SELECT series_id, series_code, series_name FROM series_table
ELSE
<QUERY B>
END
Here Query B
should replaced by your desired query.
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