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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.
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Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
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...
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, its character.
How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?
The null character (also null terminator or null byte), abbreviated NUL or NULL, is a control character with the value zero.
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 left