MySQL UNION - Shikshaglobe

MySQL UNION is a feature that allows the results of two or more SQL queries to be combined into a single result set. This can be useful when you want to combine data from multiple tables into a single report or when you want to find all the rows in a table that meet certain criteria. For example if you have a table of employees and another table of customers you could use UNION to create a combined list of all the people in both tables.MySQL UNION is a keyword used to combine the result from two or more SELECT statements. It removes duplicate rows between the various SELECT statements. Note that each SELECT statement within the UNION must have the same number of columns. The columns must also have similar data types.MySQL UNION is used to combine the result from two or more SELECT statements into a single result set. Each SELECT statement within the UNION must return the same number of columns and those columns must have the same data types. The column names from the first SELECT statement are used as the column names for the results of the UNION.MySQL UNION is a technique used to combine the results of two or more SQL queries into a single result set. This is particularly useful when you want to combine data from multiple tables into a single report. For example you could use UNION to retrieve all the orders from multiple customers or to find the total number of employees in each department. UNION is an extension of the SQL standard and is supported by most major relational database management systems.UNION is a set operator that combines the results of two or more SELECT statements into a single result set. Each SELECT statement within the UNION must have the same number of columns and corresponding data types. The columns must also be in the same order.The default behavior for UNION is to remove duplicate rows from the final result set. To include duplicate rows use the UNION ALL operator.


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