Read this SQL tutorial to learn when to use ... When to use SELECT, JOIN, UNION or subqueries When it comes to database queries, there are usually many ways to approach the same problem, but ...

Simply join two SELECT statements with the UNION keyword to combine the results of two queries into a new table. When working with databases other than Microsoft's SQL Server, check the manual to ...

BR><BR>The first query selects all of our employees and stores ... if I did:<BR><BR>select EmpAddress<BR>from tbl_Employees<BR>UNION<BR>select ContractAddress AS EmpAddress<BR>from tbl_Contractors ...

This paper proposes a method SQL detection and algorithm to detect and prevent the tautology and union query based attacks at run time. To demonstrate efficiency of this method dataset is taken ...