These queries all seem like an awful lot of unnecessary processing. Here's what I use:
SELECT 1+1
Indeed. If your server supports it, there is an even simpler one: "select 1" or "select 0".
But this is not correct SQL for an Oracle server. Equivalent Oracle syntax is "select 1 from dual".
But on other servers, "dual" does not exist by default. Well... you see what I mean...
Antonio
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