Comments are visible in Table comments field. To edit table comments select the table in the sidebar navigation and then select the Operations tab. It is great for keeping schema descriptions. MySQL and MariaDB databases allow you to add comments to tables and columns. If you want your data dictionary to be useful you need to provide explanation for tables and columns. PhpMyAdmin is a very popular free web console for MySQL and MariaDB databases written in PHP. The following example lists extended properties for all tables contained in the Sales schema.This tutorial will show you how to create a data dictionary for existing MySQL and MariaDB databases with phpMyAdmin - describe tables and columns and export them to a HTML page. Displaying extended properties on all tables in a schema USE AdventureWorks2012 įROM fn_listextendedproperty (NULL, 'schema', 'Production', 'table', 'ScrapReason', 'column', default) ĬOLUMN ScrapReasonID MS_Description Primary key for ScrapReason records.ĬOLUMN Name MS_Description Failure description.ĬOLUMN ModifiedDate MS_Description Date the record was last updated. This is contained in the schema Production. The following example lists extended properties for columns in the ScrapReason table. Displaying extended properties on all columns in a table NULL NULL MS_Description AdventureWorks2008 Sample OLTP Database USE AdventureWorks2012 įROM fn_listextendedproperty(default, default, default, default, default, default, default) The following example displays all extended properties set on the database object itself. Displaying extended properties on a database Permissions to list extended properties of objects vary by object type. ON o.name = e.objname COLLATE SQL_Latin1_General_CP1_CI_AS LEFT JOIN sys.fn_listextendedproperty(N'MS_Description', N'user',N'HumanResources',N'table', N'Employee', null, default) AS e NULL AS 'column_length', Cast(e.value AS varchar(500)) AS 'column_description' 'table_name',Ġ AS 'column_order', NULL AS 'column_name', NULL AS 'column_datatype', However you can workaround this by overriding collation in comparison. Objname is fixed as Latin1_General_CI_AI. Otherwise, the function returns an empty result set. If a lower-level object, level 1 or 2, type and name are specified, the parent object type and name should be given values that are not NULL or default. The objects are distinguished according to levels, with level 0 as the highest and level 2 the lowest. When the object type is specified and the value of the corresponding object name is NULL or default, fn_listextendedproperty returns all extended properties for all objects of the type specified. If the value for property_name is NULL or default, fn_listextendedproperty returns all the properties for the specified object. When returning extended properties on the database itself, the objtype and objname columns will be NULL. If the table returned is empty, either the object does not have extended properties or the user does not have permissions to list the extended properties on the object. This is the format of the tables returned by fn_listextendedproperty. Valid inputs are default, NULL, or an object name. level2_object_name is sysname with a default of NULL. Is the name of the level 2 object type specified. Returns extended property values of database objects. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance
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