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1 UNION SELECT 1 FROM information_schema.tables. The first step is to gather information about the database schema by crafting a valid SELECT statement.
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The SQL UNION operator concatenates the results of two queries into a single result set. We can use the ALL keyword to include all duplicates, and that includes duplicate NULLs: Select null union all select null union all select null
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?id=1' union select null,null,table_name,null from information_schema.tables Это стало возможным благодаря добавлению таблицы information_schema в MySQL 5.0+ и по ее наличию также можно косвенно определить версию используемой БД.
habr.comUnion select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. When you do a UNION query, both SELECT statements of the query must have the same number of columns.
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