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UNION ALL. The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values). The following SQL statement returns the cities (duplicate values also) from both the "Customers" and the "Suppliers" table: Example. SELECT City FROM Customers. UNION ALL. SELECT City FROM Suppliers. ORDER BY City; Try it Yourself »
- SQL UNION ALL Keyword
The UNION ALL command combines the result set of two or more...
- SQL UNION ALL Keyword
UNION ALL Syntax. The UNION operator selects only distinct values by default. To allow duplicate values, use UNION ALL:
8 wrz 2008 · The UNION ALL command is equal to the UNION command, except that UNION ALL selects all values. The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table.
When to use UNION ALL. Use UNION ALL when you want to combine all results, including duplicates, or when you know there won't be any duplicates and want better performance. It's ideal for: Combining log data from multiple sources; Aggregating data where duplicates are important; Merging data from non-overlapping datasets
The SQL UNION operator is like combining these two lists into one master list, without any duplicates. Neat, right? In SQL terms, the UNION operator allows us to combine the result sets of two or more SELECT statements. Here's the basic syntax: SELECT column1, column2, ... FROM table1 UNION SELECT column1, column2, ... FROM table2;
9 wrz 2024 · SQL UNION ALL is a powerful tool used to combine the results of two or more SELECT statements into a single result set. Unlike the UNION operator, which eliminates duplicate records and UNION ALL includes all duplicates. This makes UNION ALL it faster and more efficient when we don’t need to remove duplicates.
The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values). The following SQL statement returns the cities (duplicate values also) from both the "Customers" and the "Suppliers" table: Example Get your own SQL Server. SELECT City FROM Customers. UNION ALL. SELECT City FROM Suppliers. ORDER BY City;
