select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database.
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 know how it works can somebody help me...
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Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been
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select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type
SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both
Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types. What is the difference between
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с