sql server - T-SQL - how to compare a SELECT resultset and IN list -

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this question has answer here:

i have query , in clause want add , condition if resultset of 1 select statement in list of predefined values, otherwise condition should not added

select      field1, field2, field3 ....      table1  join      table2 on somekeymappings      condition1      , condition2      , if (select ids table2) in (1001, 1002, 1003, 1004, 1005, 1006)         condition3 group      blah, blah, blah having      blah, blah 

select field1, field2, field3 .... table1 join table2 on somekeymappings condition1 , condition2  , (table2.id in (1001, 1002, 1003, 1004, 1005,1006) , condition3       or table2.id not in (1001, 1002, 1003, 1004, 1005,1006))  group blah, blah, blah having blah, blah

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