Description. The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. It does not remove duplicate rows between the various SELECT statements (all rows are returned).,The SQL UNION Operator. The UNION operator is used to combine the result-set of two or more SELECT statements. Each SELECT statement within UNION must have the same number of columns,UNION removes duplicate records (where all columns in the results are the same), UNION ALL does not. There is a performance hit when using UNION instead of UNION ALL, since the database server must do additional work to remove the duplicate rows, but usually you do not want the duplicates (especially when developing reports).,union: select結果をマージします。allが無い場合、マージ後に重複レコードは排除されます。 また、select結果で取得する列は、それぞれ同じ列数でなければなりません,Summary: in this tutorial, you will learn how to use SQLite UNION operator to combine result sets of two or more queries into a single result set.,Microsoft Access UNION Query syntax of UNION versus UNION ALL to combine the results of two or more queries into a single result set with or without duplicates.,UNION vs. UNION ALL Examples. Let's take a look at a few simple examples of how these commands work and how they differ. As you will see the final resultsets will differ, but there is some interesting info on how SQL Server actually completes the process.,To combine result set of two or more queries using the UNION operator, there are the basic rules that you must follow: First, the number and the orders of columns that appear in all SELECT statements must be the same.,Set Operators - UNION (Transact-SQL) 08/07/2017; 7 minutes to read; Contributors. all; In this article. APPLIES TO: SQL Server (starting with 2008) Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse,The concatenation of two or more data sets is most commonly expressed in T-SQL using the UNION ALL clause. Given that the SQL Server optimizer can often reorder things like joins and aggregates to improve performance, it is quite reasonable to expect that SQL Server would also consider reordering concatenation inputs, where this would provide ...
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