![]() ![]() A table is made up of columns (or fields) and rows. ![]() ![]() Each database consists of one or more tables. It does not matter if all the three tables have different column names. A MySQL database server contains many databases (or schemas). In MySQL the UNION operator returns the combined result from multiple SELECT statements into a single result set but. While UNION removes all duplicate records resulting from this. Assume the three tables have the following contents − A UNION operation combines two subquery results of compatible row type into a single result. Suppose you have two tables that list prospective and actual customers, a third that lists vendors from whom you purchase supplies, and you want to create a single mailing list by merging names and addresses from all three tables. A UNION combines the results of two or more queries into a single result set Each result set must have the same number of columns The corresponding data types. query.phpuser1+union+select+version,1,1,1, 1,1,1,1,1,1,1. How to use mysql SELECT UNION with different ORDER by statements. You can use UNION if you want to select rows one after the other from several tables or several sets of rows from a single table all as a single result set. Whereas we use the UNION clause when we want to combine the results obtained from two queries. UNION statement to combine two resultsets. ![]()
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