Query below lists all table columns in a database. Query selectschema_name(tab.schema_id)asschema_name, tab.nameastable_name, col.column_id, col.nameascolumn_name, t.nameasdata_type, col.max_length, col.precisionfromsys.tablesastabinnerjoinsys.columnsascolontab.object_id = col.object_id...
This article describes how to delete table columns in SQL Server using SQL Server Management Studio (SSMS) or Transact-SQL.Figyelemfelhívás When you delete a column from a table, the column and all the data it contains are deleted.
SQL Graph Sequence numbers Service Broker Spatial data Stored procedures Tables Tables Manage Create Delete Duplicate Rename View Table Definition View the dependencies Add Columns Delete Columns Rename Columns Copy Columns Modify Columns Change Column Order ...
Columns table_view- name of table or view index is defined for object_type- type of object that index is defined for: Table View index_id- id of index (unique in table) type Primary key Unique Not unique index_name- index name
用户可以查询column_store_order_ordinal表中排序的列sys.index_columns或列以及排序顺序中的序列。 有关详细信息,请查看使用有序聚集列存储索引进行性能调整。 数据类型 Azure Synapse Analytics 支持最常用的数据类型。 要更好地理解数据类型以及如何使用它们,请参阅Azure Synapse Analytics 中表的数据类型。
用户可以查询column_store_order_ordinal表中排序的列sys.index_columns或列以及排序顺序中的序列。 有关详细信息,请查看使用有序聚集列存储索引进行性能调整。 数据类型 Azure Synapse Analytics 支持最常用的数据类型。 要更好地理解数据类型以及如何使用它们,请参阅Azure Synapse Analytics 中表的数据类型。
For more information, seeSpecify Computed Columns in a Table. Condensed Data Type Displays information about the field's data type, in the same format as the SQL CREATE TABLE statement. For example, a field containing a variable-length string with a maximum length of 20 characters would be re...
( logical_expression ) ] <column_set_definition> ::= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH ...
Assume that you designate a column set to return all sparse columns in a table by using the<column_set_name> FOR ALL_SPARSE_COLUMNS keyword. When you use the Copy Database Wizard to copy the database, and then you select the Use...
( logical_expression ) ] <column_set_definition> ::= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH ...