Environmental Issues
A number of SQL Server environmental settings affect the behavior of stored procedures. You specify most of these via SET commands. They control the way that stored procedures handle nulls, quotes, cursors, BLOB fields, and so forth. Two of these—QUOTED_IDENTIFIER and ANSI_NULLS—are stored permanently in each procedure's status field in sysobjects, as I mentioned earlier in the chapter. That is, when you create a stored procedure, the status of these two settings is stored along with it. QUOTED_IDENTIFIER controls whether strings within double quotes are interpreted as object identifiers (e.g., table or column references), and ANSI_NULLS controls whether non-ANSI equality comparisons with NULLs are allowed.
SET QUOTED_IDENTIFIER ...
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