Select count(*) from multiple tables Select count(*) from multiple tables oracle oracle

Select count(*) from multiple tables


sql oracle count 

SELECT  (        SELECT COUNT(*)        FROM   tab1        ) AS count1,        (        SELECT COUNT(*)        FROM   tab2        ) AS count2FROM    dual

sql oracle count

As additional information, to accomplish same thing in SQL Server, you just need to remove the "FROM dual" part of the query.

sql oracle count

Just because it's slightly different:

SELECT 'table_1' AS table_name, COUNT(*) FROM table_1UNIONSELECT 'table_2' AS table_name, COUNT(*) FROM table_2UNIONSELECT 'table_3' AS table_name, COUNT(*) FROM table_3

It gives the answers transposed (one row per table instead of one column), otherwise I don't think it's much different. I think performance-wise they should be equivalent.

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