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性能の点で以下のクエリでdiffがありますか?最適化でのIsnull()の使用
select COLUMN1,column2 from table
where COLUMN1 is not null
and COLUMN1 <>'';
select COLUMN1,column2 from table
where isnull(Column1,'')<>'';
性能の点で以下のクエリでdiffがありますか?最適化でのIsnull()の使用
select COLUMN1,column2 from table
where COLUMN1 is not null
and COLUMN1 <>'';
select COLUMN1,column2 from table
where isnull(Column1,'')<>'';
http://stackoverflow.com/questions/8924913/is-there-is-any-performance-issue-while-using-isnull-in-sql-server –