Osvaldo Kussama ha scritto:
To further explain, the following query selects both the rows from the join where id_ref_first_tab has the desired value and default_value = true, while I want to select the row corresponding to default_value = true only in case no row corresponding to id_ref_first_tab exists. select * from second_table join third_table on second_table.id = third_table.id_ref_second_tab where id_ref_first_tab = 1 or default_value = true; I hope I've been clear enough...Try: select * from second_table join third_table on second_table.id = third_table.id_ref_second_tab where id_ref_first_tab = 1 or (id_ref_first_tab <> 1 and default_value = true);
it's not what I want, because it can return two rows, while I want only one row back, checking the first condition and optionally the second one only if the first one is not matched.
I don't know if it is possible, but if it could, it would be great. -- Non c'e' piu' forza nella normalita', c'e' solo monotonia.
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