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id=1 LIMIT 1,1 UNION ALL SELECT NULL, NULL, CONCAT(0x3a717a753a,0x58797556477664726652,0x3a6561643a), NULL, NULL#.
...UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x717a6a7171
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0x31303235343830303536 is NULL - they are just matching the number of columns in your existing query. If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate those columns.
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...
Type: UNION query Title: Generic UNION query (NULL) - 18 columns Payload: id=999999.9 UNION ALL SELECT NULL,NULL,NULL,NULL,CONCAT(0x716a787171...
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The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Character Set (or Unicode), and EBCDIC.