sql - Union to handle NULL values - Stack Overflow ... Try to search 999999 9' union all select cast(0x393133353134353632312e39 as char) and '0'0 here.
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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 left
As a result, they just used `NULL values to populate those columns. the real confusion is in the CONCAT(). They are combining 126, 39, database name as hex
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...
In general, every NULL value is taken into account to vary from each alternative NULL in the database.
union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
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