id=1 LIMIT 1,1 UNION ALL SELECT NULL, NULL, CONCAT(0x3a717a753a,0x58797556477664726652,0x3a6561643a), NULL, NULL#.
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...UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x717a6a7171
0x7178627071),NULL,NULL,NULL,NULL,NULL-- FkYN ---. web server operating system: Windows 2008 or Vista web application technology
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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.
...null values to zero or o in sql, if you wanted change all the null values in your sql to numerical zero 0, this syntax will sure help you to solve the problem. in some cases i you