What is string data type in MySQL?
The string data types are CHAR , VARCHAR , BINARY , VARBINARY , BLOB , TEXT , ENUM , and SET . In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement.
What is string function in MySQL?
Inserts a string within a string at the specified position and for a certain number of characters. INSTR. Returns the position of the first occurrence of a string in another string. LCASE. Converts a string to lower-case.
Which is better varchar or text in MySQL?
TEXT has a fixed max size of 2¹⁶-1 = 65535 characters. VARCHAR has a variable max size M up to M = 2¹⁶-1 . So you cannot choose the size of TEXT but you can for a VARCHAR . The other difference is, that you cannot put an index (except for a fulltext index) on a TEXT column.
How do I cast a string in MySQL?
The CAST() function in MySQL is used to convert a value from one data type to another data type specified in the expression….MySQL CAST() Function.
Datatype | Descriptions |
---|---|
CHAR | It converts a value to the CHAR data type that contains the fixed-length string. |
What is TEXT () in MySQL?
TEXT is the family of column type intended as high-capacity character storage. The actual TEXT column type is of four types-TINYTEXT, TEXT, MEDIUMTEXT and LONGTEXT. The four TEXT types are very similar to each other; the only difference is the maximum amount of data each can store.
How do I convert a date to a string in MySQL?
In SQL Server, you can use CONVERT function to convert a DATETIME value to a string with the specified format. In MySQL, you can use DATE_FORMAT function….Mapping SQL Server Datetime Style to MySQL Format.
SQL Server | MySQL |
---|---|
CONVERT(VARCHAR, GETDATE(), 112) | DATE_FORMAT(NOW(), ‘%Y%m%d’) |
What are the different types of string in MySQL?
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. See Section 13.1.18.6, “Silent Column Specification Changes”.
How to convert one data type to another in MySQL?
There are a lot of occasions for converting one data type to another. Examples include porting data from one database vendor to another, changing the data type of a column, and temporarily switching between data types for evaluation. All of these can be achieved using MySQL’s native CONVERT () and CAST () functions.
Can a string column be changed in MySQL?
In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. See Section 13.1.18.6, “Silent Column Specification Changes” .
How are data types stored in MySQL-Tech Fry?
In this format, MySQL reserves a fixed space for the data. If the data is longer than the fixed length, only the characters that fit are stored. The remaining characters on the end are not stored. If the string is shorter than the fixed length, the extra spaces are left empty and wasted.