## How can I total up 3 select statement count?

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I have three select statements as follows and I would like to sum up total number of records. How can I do that?

SELECT COUNT(*) AS Number FROM tableA where user_id = 5 //Total 5 records SELECT COUNT(*) AS Number FROM tableB where user_id = 5 //Total 6 records SELECT COUNT(*) AS Number FROM tableC where user_id = 5 //Total 1 records

so return result will be 12.

You could apply `count(*)`

to the result of a `union all`

:

SELECT COUNT(*) FROM (SELECT user_id FROM tablea UNION ALL SELECT user_id FROM tableb UNION ALL SELECT user_id FROM tablec) t WHERE user_id = 5

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I think this should do the trick:

SELECT SUM(Number) FROM ( SELECT COUNT(*) AS Number FROM tableA where user_id = 5 UNION ALL SELECT COUNT(*) AS Number FROM tableB where user_id = 5 UNION ALL SELECT COUNT(*) AS Number FROM tableC where user_id = 5 )

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select ( select count(*) from tableA where user_id = 5 ) + ( select count(*) from tableB where user_id = 5 ) + ( select count(*) from tableC where user_id = 5 ) as total_rows from dual

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