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If[SQLExecute[con, "Select * from TABLE"] == "{}", Print["TRUE"], Print["FALSE"]]

I need to know the way, if the TABLE is empty or not

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    $\begingroup$ Why =="{}"? It's not going to return a string to you... It should be == {}. But retrieving all columns from all rows in the entire table (which could potentially be huge) is not a very good idea just to see if the table is empty, use SELECT COUNT(*) FROM table instead. $\endgroup$ – C. E. Sep 3 '14 at 6:36
  • $\begingroup$ Depending on your situation it may be better to run this in one pass and filter that list for further processing. E.g. in postgresql select schemaname, relname, n_live_tup from pg_stat_user_tables order by relname. $\endgroup$ – mfvonh Sep 3 '14 at 8:03
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Here is one options:

If[SQLExecute[con, "Select * from TABLE","MaxRows" -> 1] == {},True, False]

If it's just a test, Using MaxRows you can prevent an unnecessary data load.

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