![]() With the help of queries above we can insert the values in the table. Mysql> Insert into marks(id, name, result) values(102,'Yashraj','Fail') mysql> Insert into marks(id, name, result) values(101,'Aarav','Pass') ![]() MySQL ENUM is a Key/String Value Pair Type. For this article, the MySQL version is 8.0.23, and the storage engine is InnoDB. Especially if you add the values after the table is already in use, because you have to alter the table structure to accommodate. After reading the following 12 key facts about MySQL ENUM, you can decide if it is good for your next database or table in MySQL. The values are represented using numeric indices like 1 for the first value, 2 for the second. ENUM is the short form for the term Enumeration. The query above will create a table named marks with an ENUM field. ENUM does take up some metadata for the string value associated with it though I would say as you add more values though, any advantage starts to swing away from ENUM. In SQL, the ENUM data type is a string object that allows us to limit the entries in a particular column by permitting only the String values specified for that column during the table creation. When you insert a NULL value or 0 into the INT AUTOINCREMENT column, the value of the column is set to the next sequence value. In addition, the INT column can have an AUTOINCREMENT attribute. Example:įollowing is an example of creating a table with ENUM column − mysql> Create table marks(id int Primary key NOT NULL, Name Varchar(255) NOT NULL, Result ENUM('Pass', 'Fail') NOT NULL) Because integer type represents exact numbers, you usually use it as the primary key of a table. In the above syntax, we have three enumeration values. We can create ENUM columns in MySQL with the help of the following syntax − CREATE TABLE table_name( Surprisingly, the empty string '' is stored internally as a 0. For example, your ENUM of '0', is stored internally as a numeric 1, and your '1', is stored as a numeric 2. For creating an ENUM column, the enumeration value must be a quoted string literals. As an ENUM field is really just an INT UNSIGNED, it will not work as you expect, if you use integer values for the ENUMs.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |