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SELECT id, SUM(CASE WHEN status = 3 THEN 1 ELSE 0 END) as status_3_count FROM yourtable GROUP BY id. or just use a WHERE status = 3 and a COUNT(id).
Processing SELECT COUNT(*) statements takes some time if index records are not entirely in the buffer
Синтаксис: ; (S): SELECT * FROM members; DROP members-- Один запрос закончился
Функция CONCAT предназначена для сложения строк при выборке из базы данных. Строками обычно выступают поля таблиц.
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( SELECT COUNT(*) FROM actest WHERE LS = b.LS AND DATE(ET) = b.ED ) AS TotalCount, Putting it all together... (I'm not sure I got it right.)
If they are not then a SELECT against the table will return no messages (i.e. appear to hang). Why? If you don't have a message key then the semantics of a TABLE don't make any sense (since
SELECT FirstName, COUNT(*) FROM Person.Person GROUP BY FirstName. Посмотрел на план запроса и увидел там явно неадекватное значение Estimated number of rows