Data types in mysql with examples

Get peak performance with the No-Limits Data base. MemSQL is a distribute highly-scalable SQL data base that can run anywhere. CHAR (M) − A fixed-length string between and 2characters in length (for example CHAR (5)), right-padded with spaces to the specified length when stored. Defining a length is not require but the default is 1. It also supports the approximate numeric data types ( FLOAT , REAL, and DOUBLE PRECISION ). String data types are normally used to store names, addresses, descriptions or any value that contains letters and numbers including binary data, like image or audio files. A data type defines what kind of value a column can hold: integer data , character data , monetary data , date and time data , binary strings , and so on.

Each column in a database table is required to have a name and a data type. This is useful when you want to store a “possibly wrong” value which the user has specified (for example, in a web form) in the database for future processing. The native JSON data type allows you to store JSON documents more efficiently than the JSON text format in the previous versions. Moreover, it also supports the BIT data type that can accept bit values. A numeric type can either be signed or unsigned.

But the BIT type is a combination of 0s and 1s. Data types ensure the correctness of the data provided. Geometry is a word that denotes a geographic feature. The following table illustrates the characteristics of each integer type including storage in bytes, minimum value, and maximum value. String: including fixed-length and variable-length strings, binary data , and collections (enumeration and set).

These types include the exact numeric data types ( INTEGER , SMALLINT , DECIMAL, and NUMERIC ), as well as the approximate numeric data types ( FLOAT , REAL, and DOUBLE PRECISION ). The keyword INT is a synonym for INTEGER, and the keywords DEC and FIXED are synonyms for DECIMAL. The visitor column is used to store the visitor information. The properties and browser columns are the JSON columns.

They are used to store properties of an event and specification of the browser that visitors use to browse the website. MySQL JSON data type example. BLOB(size) Maximum size of 65bytes. LONGTEXT: Maximum size of 4GB or 29962characters.

SQL data types can be broadly divided into following categories. Date and Time data types such as Date, Time, Datetime etc. Character and String data types such as char, varchar, text etc.

Unicode character string data types , for example nchar, nvarchar, ntext etc. A SET datatype can hold any number of strings from a predefined list of strings specified during table creation. When you need a string data type column to only store allowable values from a preferred list, this is one area where an ENUM is a strong candidate. Although you can use Oracle CLOB columns in string functions, you cannot use them in GROUP BY and ORDER BY. It means that the total length of all columns should be less than 65bytes.

Let’s take a look at an example. It uses many different data types broken into mainly three categories: numeric, date and time, and string types. Where size is the number of characters to store. This statement is used to create a new table in a database. It is exactly characters long.

The TIMESTAMP value shows in UTC by default. Example – Larger ‘time’ Values. The time data type can have a range from -838:59:to 838:59:59. This is because it’s not just limited to representing the time of day.

It could also be used to represent elapsed time. In this case, we use it to add a large number of hours to a date value. Followings are some points about BLOB data type: BLOB is the family of column type intended as high-capacity binary storage. The actual BLOB column type is of four types -TINYBLOB, BLOB, MEDIUMBLOB and LONGBLOB. You can use the information_schema columns table: SELECT DATA _TYPE FROM INFORMATION_SCHEMA.

Also note if the data type has a set length, eg. Using BIGINT will save you bytes per row over VARCHAR(10).