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The UNION operator combines two query results. It produces all the unique rows that result from both queries; that is, it returns a row if it occurs in the first table, the second, or both. UNION does not return duplicate rows. If a row occurs more than once, then only one occurrence...
The following examples useUNIONto combine the results of three tables that all have the same 5 rows of data. The first example usesUNION ALLto show the duplicated records, and returns all 15 rows. The second example usesUNIONwithoutALLto eliminate the duplicate rows from the combined results ...
Duplicate records in SQL, also known asduplicate rows,are identical rows in an SQL table. This means, for a pair of duplicate records, the values in each column coincide. Usually, we will retrieve duplicate data, when we are joining tables.So, if you want to learn a thing or two about...
The UNION and UNION ALL operators both are used for combine the output of two or more SELECT queries, but they differ in handling duplicate rows: UNION: UNION operators combine the results of multiple SELECT queries and remove duplicate rows. It returns only distinct values across all queries....
-- remove duplicate rows on order_id and keep the first occurrence row, -- because there shouldn't be two orders with the same order_id. -- 移除重复项,保留第一行 SELECTorder_id,user,product,num FROM( SELECT*, ROW_NUMBER()OVER(PARTITIONBYorder_idORDERBYproctimeASC)ASrow_num ...
02/14/2025 Applies to:SQL Server Use the SQL Editor to edit existing stored procedures, functions, triggers, and SQL scripts. This window opens when you open any of those objects. If you want to create a new SQL statement to run against your data source, use theSQL Paneof Query Designe...
Combines the final result for oneSELECTstatement with the final result of anotherSELECTstatement.UNIONchecks the combined results and eliminates duplicate rows by default. To combine multipleUNIONclauses, use parentheses. You can use theUNIONclause to simulate an outer join. ...
The following examples use UNION to combine the results of three tables that all have the same 5 rows of data. The first example uses UNION ALL to show the duplicated records, and returns all 15 rows. The second example uses UNION without ALL to eliminate the duplicate rows from the combi...
The following examples use UNION to combine the results of three tables that all have the same five rows of data. The first example uses UNION ALL to show the duplicated records, and returns all 15 rows. The second example uses UNION without ALL to eliminate the duplicate rows from the co...