gulmeli-ehvalat-and-select-1-from-select-count-concat-select...
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SELECT COUNT(*)(SELECT DISTINCT a.my_id, a.last_name, a.first_name, b.temp_val. FROM Table_A a INNER JOIN Table_B b on a.a_id = b.a_id).
select concat(0x217e21,d. schema_name,0x217e21). from information_schema. schemata as d.
SELECT COUNT(*) AS num_rows FROM (SELECT * FROM sysobjects WHERE TYPE = 'u' AND name = 'system_configuration') Derived.
InnoDB handles SELECT COUNT(*) and SELECT COUNT(1) operations in the same way. There is no performance difference.
mysql> SELECT * FROM worker WHERE name LIKE 'And%'
FROM (SELECT ...) Надо найти имя таблицы из другой таблицы, а потом из этой найденной таблицы сделать...
String Functions ASCII Char Charindex Concat Concat with + Concat_WS Datalength Difference Format Left LEN Lower Ltrim Nchar Patindex Quotename Replace Replicate
Синтаксис: ; (S): SELECT * FROM members; DROP members-- Один запрос закончился