sql server - IF statement in MS SQL when function return empty string -


i need check when function in ms sql return empty string ('') in insert table , handle condition. don't know how. use syntax:

insert [db].[dbo].[tablesnames] (name) values (case        when [dbo].function(@id, @externalname, @level) ''        @name        else [dbo].function(@id, @externalname, @level))

how correct syntax in case? thx advance.

i more inclined write as:

insert [db].[dbo].[tablesnames](name)     select (case when x = '' @name else x end)     (select [dbo].function(@id, @externalname, @level) val) x;

functions incur overhead when called. formulation gives sql server opportunity evaluate function once.

a couple more things:

  • i don't recognize is. might mean is null?
  • if looking @ blank values (empty strings) want consider null values?

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