exist in sql code example

Example 1: if exists sql server

IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') 
BEGIN
   SELECT 1 
END
ELSE
BEGIN
    SELECT 2
END

Example 2: select true if exists on another table or false sqlserver

select A.name, 
       CASE WHEN B.name IS NOT NULL
       THEN 1
       ELSE 0
       END

    from table1 A
    left join table2 B
    on A.name = B.name

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