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An easier method is available starting with MSSQL 2005 and higher. The XML function path() works as a concatenator, allowing the retrieval of all tables with 1 query. SELECT table_name %2b ', ' FROM information_schema.tables FOR XML PATH('').
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First of all, the main premise is to "create a program so that SQL injection does not occur". If an SQL statement is properly assembled by binding or the like, an attack that tries to screw something into a parameter will only leave a log and will have no effect.
The combined dataset may be grouped further by a common column(s) if any. By adding NULLs we can work-around the UNION requirement that all SELECT statements must have the same number of columns with similar types.
Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
This article will provide a deep dive into the SQL Union operator, describing its many uses along with examples and explore some common questions like the differences between Union vs Union All.
...(WAF Bypassing).in this tutorial you will learn how to Build A union Based Query and then Get Data from the database.and About Union based SQL injection And WAF Bypassing Techniques.
With union you can select more data in one SQL statement.