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Category:1961 films Category:Indian films Category:1960s Hindi-language films Category:Films directed by Manmohan DesaiQ: Oracle SQL: Why it is a bad practice to SELECT with a correlated subquery? In Oracle SQL, one says that it is a bad practice to SELECT with a correlated subquery. But I cannot understand why. For example, say we have a SQL with these two tables: clients(c_id, name) transactions(t_id, c_id, ammount) Given that I have a client with c_id = 3, I'm trying to select a list of all his transactions, ordered by the ammount and such list must be correlated, so that one transaction is related to one record. It seems that the following SELECT statement is okay to me. SELECT t.t_id, t.c_id, t.ammount, t.date_act FROM transactions t INNER JOIN (SELECT c.c_id, c.name, c.ammount FROM clients c WHERE c.c_id = 3) t_inv ON t.c_id = t_inv.c_id ORDER BY t_inv.ammount DESC, t.date_act Why is it a bad practice? EDIT: I would appreciate if someone provides a working example, since I have been trying for a while to figure out why it is bad. EDIT: The fact that I would like a list of a single client ordered by his/her last transactions is completely irrelevant, that is the reason why it was said that it is a bad practice. A: It seems that the following SELECT statement is okay to me. No, it isn't. Because you've selected the outer table (t) twice, there's no guarantee that your results will be unique. This is what it means by "correlated": A correlated subquery is a query that uses a result set from a subquery as part of the outer query. A correlated subquery is correlated if the result of the subquery is derived from, or is correlated to, the result set of the outer query. Your query is a correlated subquery. Here's









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