--add identity column altertabletable1addcol3intidentity(1,1) GO --rename or remove old column execsp_rename'table1.col1','oldcol1','column' OR altertabletable1dropcolumncol1 --rename new column to old column name execsp_rename'table1.col3','col1','column' GO --add new test rec...
--add identity column altertabletable1addcol3intidentity(1,1) GO --rename or remove old column execsp_rename'table1.col1','oldcol1','column' OR altertabletable1dropcolumncol1 --rename new column to old column name execsp_rename'table1.col3','col1','column' GO --add new test rec...
Alter Table Add Column if Not Exists to update Schema Modification Script Alter Table add Column - How do you add a column after say the second column Alter table add constraint primary key clustered identity(1,1) ALTER TABLE ALTER COLUMN (To set the default value) ALTER TABL...
{ { ALTER | CHANGE } [ COLUMN ] { column_identifier | field_name } { COMMENT comment | { FIRST | AFTER column_identifier } | { SET | DROP } NOT NULL | TYPE data_type | SET DEFAULT clause | DROP DEFAULT | SYNC IDENTITY | SET { MASK clause } | DROP MASK | SET TAG...
外键字段不能是IDENTITY字段。 减少约束限制 默认情况下,如果外键约束引用唯一键约束或主键约束,则不能删除该约束。这样做会导致SQLCODE -317错误。要更改此默认外键约束行为,请参考SEToption命令的COMPILEMODE=NOCHECK选项。 删除主键约束的效果取决于主键也是ID键设置的设置(如上所述): ...
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.AlterTableAlterColumnStatement.AlterTableAlterColumnStatement in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
第二章 SQL命令 ALTER TABLE(二)删除列限制 DROP COLUMN可以删除指定为逗号分隔列表的多个列定义。每个列出的列名后面必须紧跟其RESTORY或CASCADE(如果未指定,则默认为RESTRICE)和%DELDATA或%NODELDATE(如果未…
[ COLUMN ] column_name SET DEFAULT expression ALTER [ COLUMN ] column_name DROP DEFAULT ALTER [ COLUMN ] column_name { SET | DROP } NOT NULL ALTER [ COLUMN ] column_name DROP EXPRESSION [ IF EXISTS ] ALTER [ COLUMN ] column_name ADD GENERATED { ALWAYS | BY DEFAULT } AS IDENTITY [...
例如,陳述式 CREATE TABLE T (C1 int CONSTRAINT MyConstraint IDENTITY) 會執行,但是限制式名稱不會保留,也無法供使用者存取。 資料行屬性 ROWGUIDCOL 和IDENTITY 無法命名為限制式。 傳回錯誤 156。 低 使用雙向指派來更新資料行 (例如 UPDATE T1 SET @v = column_name = <expression>) 會產生非預期的結...
(idINTIDENTITY(1,1), [dbid]INT, [dbname] sysname, fgname sysname, isdoneBIT);INSERTINTO#tmpdbs ([dbid], [dbname], [isdone])SELECTdatabase_id,name,0FROMmaster.sys.databases (NOLOCK)WHEREis_read_only =0ANDstate =0;DECLARE@dbidINT, @queryVARCHAR(1000), @dbname sysname, @fgname ...