Tom Lane <t...@sss.pgh.pa.us> wrote: > Peter Eisentraut <pete...@gmx.net> writes: >> SQL standard: > >> <SQL-data access indication> ::= >> NO SQL >> | CONTAINS SQL >> | READS SQL DATA >> | MODIFIES SQL DATA > > Huh. I understand three of those, but what is the use of CONTAINS > SQL? Seems like that would have to be the same as the last one, > or maybe the next-to-last one if you're prepared to assume it's > read-only SQL. On a quick search of the spec, the best I was able to tell was that you are required to use "CONTAINS SQL" if the language is SQL. Perhaps it figures that the database engine can determine the read/write behavior directly if the language is SQL, and you tell it what it does if you're coding in some other language. -Kevin
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