MySQL data types

​MySQL database has several data types. I will try to explain most common of these, please choose a specific data type that feet your needs.

Out of whole numbers data types there are: TINYINT, SMALLINT, MEDIUMINT, INT, BUGINT.

There are two data types that hold a list of values. These data types are: ENUM and SET.

To keep date data type it is possible to do with the help of DATE data type.

DATETIME can be used to store both date and time information.

TIMESTAMP data type can be used for the case when this database record was created or updated. The field that has this data type is updated automatically whenever this record is created or updated.

CHAR is a data type that holds characters and has specific length.

TEXT is a data type that can hold more than a single character. There are several TEXT type definitions, each one with a different number of maximum number of characters.

VARCHAR is data type that can hold variable length of characters. VARCHAR data type has a maximum number of characters, this number is specified when a database column of this data type is created.

BLOB data type is used to store variable length binary data.

Comments

Post a Comment

Popular posts from this blog

Absolute and relative path in HTML pages

HTML documents can have relative or absolute links to other web pages. Relative links keeps a visitor on the same web site. Relative links are pointers to other web pages on the same web site. They just contain this page filename. Absolute links on other hand contain full path including protocol and domain name to access the page. Absolute links can point to the same web site or they can point to a different web site.
Read more

Errors

It is a good idea to send errors in production environment to error log. Errors may contain sensitive information. Even so errors maybe helpful to development team or to QA team, errors need to be suppressed in production environment for viewing by everyone. Errors are good way to troubleshoot an issue therefore only trusted people can have access to this information. If not a trusted person get an access to this information, this information maybe used against the company and for a personal benefit. What to do in a case when there are more servers than one? Even so it is possible to inspect the log files in a single server, however it is impossible to do so when there is more than one server is available and web traffic is redirected to a different server each time. Log aggregation is needed in this case. All of the logs will be send to a central location. Logs may contain sensitive information. Please consult your company lawyer of how long logs can be stored, because logs can be use...
Read more

goto PHP operator

goto operator will skip execution of code and continue execution of a code that follows a label to which goto operator points to. If code has many goto operators, than this code probably needs a revision. It is possible to write code that executes without goto operators.
Read more