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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 »
Jun 3, 2024 · Learn how to use SQL UNION ALL command to combine the results of two or more SELECT statements in SQL. See syntax, examples, differences with UNION, and FAQs.
- 5 min
Jun 3, 2024 · Learn the difference between UNION and UNION ALL operators in SQL, which are used to combine the results of multiple SELECT statements. See syntax, examples, and performance impact of each operator.
- 5 min
- Union vs. Union All: Syntax
- SQL Union All Syntax
- SQL Union and Union All Explained
- SQL Union vs Union All: Example
- Union Or Union All – Which Should You Choose?
- Write Complex Queries with Union and Union All
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The syntax of both UNIONvariants is very similar. Let’s look at them individually, starting with UNION.
Remember, UNION ALL combines the results of two or more SELECT statements, showing all values, including duplicatesif they exist. The SQL syntax below shows a UNION ALL occurring between two different tables. Once again, the columns in the SELECT are of the same or matching data types and the WHEREclause is optional:
There are several usage rules for UNION and UNION ALL. Failure to adhere to these rules will result in error messages: 1. The number of columns used in your first query and your second query must be the same and the data types (e.g. INT, VARCHAR, etc.) must match. 2. The column names included in both queries can differ; when this is the case, the r...
Let’s look at a practical example to gain greater understanding of UNION vs. UNION ALL. Imagine we have a database with information on several clubs. Each table will show the members of that club and what location they attend. Each club may have several different branches or locations where they meet. The first table is for the book_club. It contai...
Now that you know how to use both UNION and UNION ALL, you’re probably wondering which one is best for your situation. One thing to consider is the fact that UNIONremoves duplicate records, which can impact the performance of your query. If you’re wondering which variant to use, remember: 1. Using UNION effectively performs a SELECT DISTINCTon the ...
We’ve covered the differences between UNION and UNION ALL and why you might choose one or the other. With this information, you can now retrieve data from two or more tables in your database. Both UNION and UNION ALL play an important role in the use of recursive queries, a more advanced topic that is covered in great detail in our Recursive Querie...
Learn how to use UNION and UNION ALL to combine records from multiple tables in SQL. See the syntax, examples, and performance implications of each set operator.
- Andrew Bone
This SQL tutorial explains how to use the SQL UNION ALL operator with syntax and examples. The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements (does not remove duplicate rows).
Jan 5, 2023 · Learn how to use UNION and UNION ALL clauses to combine the results of multiple queries in SQL. See examples, differences, and best practices with LearnSQL.com.
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Learn how to use the SQL UNION operator to merge rows from multiple queries into a single result set. See the difference between UNION and UNION ALL, and how to sort the result set with ORDER BY.
