oracle_union_operator SQL: UNION Operator This SQL tutorial explains how to use the SQLUNION operatorwith syntax and examples. Description The SQL UNION operator is used to combine the result sets of 2 or more SELECT statements. It removes duplicate rows between the various SELECT statements. Eac...
UNION ALL Syntax TheUNIONoperator selects only distinct values by default. To allow duplicate values, useUNION ALL: SELECTcolumn_name(s)FROMtable1 UNIONALL SELECTcolumn_name(s)FROMtable2; Note:The column names in the result-set are usually equal to the column names in the firstSELECTstatement...
SQL UNION ALL Operator TheUNION ALLoperator selects fields from two or more tables similar toUNION. However, unlikeUNION,UNION ALLdoesn't ignore duplicate fields. Let's try the previous SQL command again usingUNION ALLinstead ofUNION. -- select the union of age from Teachers and Students tabl...
In SQL Server, the UNION operator is used to combine the result set of two or more SELECT statements into a single result set. This allows you to retrieve data from multiple tables or queries and present it as a single entity. The UNION operator removes duplicate rows from the result set ...
The SQL UNION operator treats all NULL values as a single NULL value when evaluating duplicate. When combining with UNION, the ALL or DISTINCT operator is optional. The ALL operator allows duplicate rows to appear in the combined result set. The DISTINCT operator eliminates duplicate rows. If ...
Syntax Arguments Examples Examples: Azure Synapse Analytics and Analytics Platform System (PDW) See Also Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fa...
SELECTlast_nameFROMemployeesUNIONALLSELECTlast_nameFROMcontactsORDERBYlast_name;Code language:SQL (Structured Query Language)(sql) Try it The query returns 426 rows. In addition, some rows are duplicates e.g.,Atkinson,Barnett. This is because theUNION ALLoperator does not remove duplicate rows. ...
SQL UNION UNION The SQL UNION operator combines the results of two or more queries and makes a result set which includes fetched rows from the participating queries in the UNION. Contents: Basic Rules SQL:s UNION with Inner Join SQL: Union vs Union All...
The number and the order of the columns must be the same in all queries. The data types must be compatible. Transact-SQL syntax conventions Syntax syntaxsqlKopiraj {<query_specification>| (<query_expression>) } {UNION[ALL] {<query_specification>| (<query_expression>) } [ ...n ] } ...
The number and the order of the columns must be the same in all queries. The data types must be compatible.Transact-SQL syntax conventionsSyntaxsyntaxsql Kopeeri { <query_specification> | ( <query_expression> ) } { UNION [ ALL ] { <query_specification> | ( <query_expression> ) } ...