如何修改 一个字段的属性 sqlserver
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发布时间：2022-04-10 18:54
共1个回答
热心网友
时间：2022-04-10 20:23
脚本如下：
Alter table [表名] Alter column [列名] [列类型] [NOT NULL或者 NULL]
alter table 脚本很丰富，可以查看MS SQL的帮助，新手做任务，给个满意吧
ALTER TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name
{
ALTER COLUMN column_name
{
[ type_schema_name. ] type_name [ ( { precision [ , scale ]
| max | xml_schema_collection } ) ]
[ COLLATE collation_name ]
[ NULL | NOT NULL ]
| {ADD | DROP }
{ ROWGUIDCOL | PERSISTED | NOT FOR REPLICATION | SPARSE }
}
| [ WITH { CHECK | NOCHECK } ]
| ADD
{
<column_definition>
| <computed_column_definition>
| <table_constraint>
| <column_set_definition>
} [ ,...n ]
| DROP
{
[ CONSTRAINT ] constraint_name
[ WITH ( <drop_clustered_constraint_option> [ ,...n ] ) ]
| COLUMN column_name
} [ ,...n ]
| [ WITH { CHECK | NOCHECK } ] { CHECK | NOCHECK } CONSTRAINT
{ ALL | constraint_name [ ,...n ] }
| { ENABLE | DISABLE } TRIGGER
{ ALL | trigger_name [ ,...n ] }
| { ENABLE | DISABLE } CHANGE_TRACKING
[ WITH ( TRACK_COLUMNS_UPDATED = { ON | OFF } ) ]
| SWITCH [ PARTITION source_partition_number_expression ]
TO target_table
[ PARTITION target_partition_number_expression ]
| SET ( FILESTREAM_ON = { partition_scheme_name | filegroup |
"default" | "NULL" } )
| REBUILD
[ [PARTITION = ALL]
[ WITH ( <rebuild_option> [ ,...n ] ) ]
| [ PARTITION = partition_number
[ WITH ( <single_partition_rebuild_option> [ ,...n ] ) ]
]
]
| (<table_option>)
}
[ ; ]
<column_set_definition> ::=
column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS
<drop_clustered_constraint_option> ::=
{
MAXDOP = max_degree_of_parallelism
| ONLINE = {ON | OFF }
| MOVE TO { partition_scheme_name ( column_name ) | filegroup
| "default" }
}
<table_option> ::=
{
SET ( LOCK_ESCALATION = { AUTO | TABLE | DISABLE } )
}
<single_partition_rebuild__option> ::=
{
SORT_IN_TEMPDB = { ON | OFF }
| MAXDOP = max_degree_of_parallelism
| DATA_COMPRESSION = { NONE | ROW | PAGE} }
}
