Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really
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select concat(0x217e21,d. schema_name,0x217e21). from information_schema. schemata as d.
if exists( select top(1) sk.Username from SurrogateKeys as sk. inner join SurrogateKeyRelatives as skr on sk.Id = skr.SurrKeyId.
FROM (SELECT ...) Надо найти имя таблицы из другой таблицы, а потом из этой найденной таблицы сделать...
mysql> SELECT COUNT(DISTINCT results) FROM student; In MySQL, you can obtain the number of distinct expression combinations that do not contain
mysql> SELECT * FROM worker WHERE name LIKE 'And%'
Symptom If they are not then a SELECT against the table will return no messages (i.e. appear to hang).
SELECT COUNT(column_name) FROM table_name WHERE condition; AVG() Syntax.
Синтаксис: ; (S): SELECT * FROM members; DROP members-- Один запрос закончился