![]() Suppose that you want to combine the first name and last name of employees and customers into a single result set, you can use the UNION operator as follows: SELECTĬustomers Code language: SQL (Structured Query Language) ( sql )Īs you can see from the output, the MySQL UNION uses the column names of the first SELECT statement for the column headings of the output. We’ll use the customers and employees tables in the sample database for the demonstration: The following picture illustrates the difference between UNION and JOIN: MySQL UNION and column alias examples JOINĪ JOIN combines result sets horizontally, a UNION appends result set vertically. UNION ALL SELECT id FROM t2 Code language: SQL (Structured Query Language) ( sql ) + -+Ħ rows in set ( 0.00 sec) Code language: SQL (Structured Query Language) ( sql )Īs you can see, the duplicates appear in the combined result set because of the UNION ALL operation. Because UNION ALL does not need to handle duplicates, it performs faster than UNION DISTINCT . If you use the UNION ALL explicitly, the duplicate rows, if available, remain in the result. The following Venn diagram illustrates the union of two result sets that come from t1 and t2 tables: The final result set contains the distinct values from separate result sets returned by the queries: + -+Ĥ rows in set ( 0.00 sec) Code language: SQL (Structured Query Language) ( sql )īecause the rows with value 2 and 3 are duplicates, the UNION removed them and kept only unique values. UNION SELECT id FROM t2 Code language: SQL (Structured Query Language) ( sql ) The following statement combines result sets returned from t1 and t2 tables: SELECT id FROM t1 INSERT INTO t2 VALUES ( 2),( 3),( 4) Code language: SQL (Structured Query Language) ( sql ) Let’s see the following sample tables: t1 and t2: DROP TABLE IF EXISTS t1 Second, the data types of columns must be the same or compatible.īy default, the UNION operator removes duplicate rows even if you don’t specify the DISTINCT operator explicitly.First, the number and the orders of columns that appear in all SELECT statements must be the same.To combine result set of two or more queries using the UNION operator, these are the basic rules that you must follow: Code language: SQL (Structured Query Language) ( sql ) ![]() The following illustrates the syntax of the UNION operator: SELECT column_list MySQL UNION operator allows you to combine two or more result sets of queries into a single result set. ![]() Summary : in this tutorial, you will learn how to use MySQL UNION operator to combine two or more result sets from multiple SELECT statements into a single result set.
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First, run the following command to create a view: CREATE VIEW students_onlyname AS SELECT name FROM students Code language: SQL (Structured Query Language) ( sql ) How to tell tables and views apartĭoes the SHOW tables command also show views? Despite the name, yes. Now we’re ready to proceed to more interesting examples. You’ve just seen the most basic way you can use the show tables command. + -+ Code language: SQL (Structured Query Language) ( sql ) MySQL SHOW tables: some practical examples You should see the tables being listed: + -+ Id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,Įmail VARCHAR( 100)) Code language: SQL (Structured Query Language) ( sql ) In the CoderPad MySQL sandbox, let’s create two tables: CREATE TABLE students ( So, there’s an opportunity to automate some tasks that simply wouldn’t be possible using a GUI. When using it, you can leverage clauses such as WHERE and LIKE to further filter the output.įinally, since this is a command, you can use it in scripts. Also, keep in mind that this command is super flexible. If the command line is all you have, show tables comes in handy. But what are the uses cases for it? After all, when using a MySQL GUI (graphical user interface) client, you can easily display the tables inside a database, typically in a tree.įirst, you won’t always have access to a GUI when interacting with MySQL. That’s pretty much it when it comes to defining the command. In MySQL, the show tables command is what you use to list the tables in a database. Also, you should have access to a MySQL local installation.Ī great way to do that is to use the CoderPad MySQL Sandbox to quickly and easily get started writing SQL as it’ll be your MySQL client for this article. ![]() ![]() First, I expect some basic MySQL and SQL knowledge. ![]() There are only two prerequisites if you want to follow along with the examples I’ll give. We’ll also cover how listing tables in MySQL compare with other RDBMSs (relational database management systems.) An alternative way to list the tables in a database without using the show tables command.Why it’s useful in the first place, and.The MySQL SHOW tables command is very appropriately named since it allows you to list tables on a MySQL database.īy the end of the post, you’ll have learned: |
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