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select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null
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...
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 blank during record creation!
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SQLite Null Values. Generally, all relational databases will support a special value called NULL and it is used to represent missing information.
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NULL is a special value that signifies 'no value'. Comparing a column to NULL using the = operator is undefined. Instead, use WHERE IS NULL or WHERE IS NOT NULL. The definitive guide for data professionals. See 2 min video.