System SQL Functions

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Function	SQLite	Description
COALESCE( arg1,..., argN )	Yes	Returns the first argument passed to it that is non-NULL. Returns NULL if all arguments are NULL. Requires at least two arguments.
IFNULL( arg1, arg2 )	Yes	Returns arg1 if not NULL, otherwise arg2. Basically, IFNULL is a two-argument version of COALESCE().
NULLIF( arg1, arg2 )	Yes	Returns arg1 if arg1 and arg2 are different and returns NULL if the arguments are equal. Used when you have non-NULL values in your database that you want to treat as NULL.

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Help created on 7/12/2018