11/10/2023 0 Comments Enum type mysqlSee the following statement: INSERT INTO tickets(title) ( 'Create a new user for the new employee David', 'High') īecause we defined the priority as a NOT NULL column, when you insert a new row without specifying the value for the priority column, MySQL will use the first enumeration member as the default value. Let’s add some more rows to the tickets table: INSERT INTO tickets(title, priority) Since Low is mapped to 1, it is acceptable. In this example, instead of using the Low enumeration value, we used value 1. VALUES( 'Upgrade Windows OS for all computers', 1) For instance, the following statement inserts a new ticket with the Low priority: INSERT INTO tickets(title, priority) VALUES( 'Scan virus for computer A', 'High') īesides the enumeration values, you can use the numeric index of the enumeration member for inserting data into an ENUM column. For example, the following statement inserts a new row into the tickets table. To insert data into an ENUM column, you use the enumeration values in the predefined list. In this case, Low, Medium, and High are map to 1, 2 and 3 respectively. Behind the scenes, MySQL maps each enumeration member to a numeric index. The priority column will accept only three values Low, Medium and High. Priority ENUM( 'Low', 'Medium', 'High') NOT NULL To assign the priority column the ENUM type, you use the following CREATE TABLE statement: CREATE TABLE tickets ( Suppose, we have to store ticket information with the priority: low, medium, and high. However, it is a good practice to keep the number of enumeration values under 20. In this syntax, you can have more than three enumeration values. To define an ENUM column, you use the following syntax: CREATE TABLE table_name (Ĭol ENUM ( 'value1', 'value2', 'value3'),Ĭode language: SQL (Structured Query Language) ( sql ) MySQL ENUM uses numeric indexes (1, 2, 3, …) to represents string values. The ENUM data type provides the following advantages: In MySQL, an ENUM is a string object whose value is chosen from a list of permitted values defined at the time of column creation. For more reference, check the official documentation of MySQL.Summary: in this tutorial, you will learn how to use MySQL ENUM data type for defining columns that store enumeration values. Thanks for reading! We’ve studied MySQL ENUM data type and how it is implemented. It is simple to use and efficient, making it a good choice for many applications. In conclusion, MySQL ENUM is a powerful data type that can be used to store a limited set of values. To get the complete enumeration list, one needs to access the information_schema database.You can not use another table as a priority list.ENUM is not SQL standard and only some database systems support it which as a result proves to be difficult when porting to RDBMS.If we want to change the enumeration of the list, then we have to recreate the whole table which proves to be expensive in terms of time.It reduces errors that are caused by mistyping the numbers. Order By priority DESC Code language: SQL (Structured Query Language) ( sql ) Sorting ENUM 2 Advantages of ENUM in MySQL For Descending order- Select name, priority From The values are sorted in ascending order by default. We’ll use the ORDER BY clause to sort enum values in MySQL- Select name, priority From The ENUM values are based on the index number and therefore the order of those values will depend on how they were defined in the list. Output- ENUM 2 How to Sort MySQL ENUM Values Code language: SQL (Structured Query Language) ( sql )
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