SQL Query to get data using [ query 2 ] in case [ query 1 ] has no results .

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Hello,

I need to make a select statement that if query 1 return no results , so it should execute another query

for example :
select username from users where id = (select top 1 id from table1)

i want if query1 (select top 1 id from table1) return null or 0 results ,
so it should execute query 2 =(select top 1 id from table2)

IS that possible ?

note : i don't want to use any server side code like php or c#
i need to do it only using SQL

Posted 23-Mar-15 3:53am

Hercal

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Kornfeld Eliyahu Peter · Answer 1 · 2015-03-23T03:56:00

Solution 1

You can use @@ROWCOUNT[^] for that...

SQL

SELECT ... FROM ...

IF(@@ROWCOUNT = 0)
  SELECT ... FROM ...

Posted 23-Mar-15 3:56am

Kornfeld Eliyahu Peter

Peter Leow · Answer 2 · 2015-03-23T04:13:00

Solution 2

Try NOT EXISTS[^]

Posted 23-Mar-15 4:13am

Peter Leow