* Mark Wordsall
> So there is no join is this sql statement, I say this cos I see no word
> saying JOIN?

Yes, there are. The comma separating table names in the FROM clause are
synonyms for 'INNER JOIN', and the actual joining is done in the WHERE
clause, where you match the different tables, in this case using
'table_a.table_b_id=table_b.id'.

--
Roger


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