1.语法:ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 3.添加外键 1.语法:ALTER TABLE 表名 ADD CONNSTRAINT 外键名 FOREIGN KEY(外键字段) REFERENCES 关联表名(关联字段); 4.插入单(多)条数据记录(和SQL Server相同,但是不能用select多列添加数据) 1.INSERT INTO 表名[(字段名...
ALTERTABLE表名DROPCONSTRAINT主键名称ALTERTABLE表名ADDCONSTRAINT主键名称PRIMARYKEY(列1,列2,...) 1. 2. 3. 4. 5. DROP CONSTRAINT:用于删除约束的 SQL 命令。 表名:要修改的表的名称。 主键名称:要删除的主键的名称。 ADD CONSTRAINT:用于添加约束的 SQL 命令。 主键名称:新主键的名称。 (列1, 列2, ...
To create a clustered primary key on an existing table:[cc lang=”sql”] ALTER TABLE dbo.Person ADD CONSTRAINT PK_Person PRIMARY KEY CLUSTERED (PersonID); [/cc]To create a non clustered primary key on an existing table:[cc lang=”sql”] ALTER TABLE dbo.Person ADD CONSTRAINT PK_Person ...
1 ALTERTABLEdbo.YourTableADDIDINTIDENTITY 2 ALTERTABLEdbo.YourTableADDCONSTRAINTPK_YourTablePRIMARYKEY(ID) Or by one line ALTERTABLEdbo.YourTableADDIDINTIDENTITYCONSTRAINTPK_YourTablePRIMARYKEYCLUSTERED See-- https://stackoverflow.com/questions/4862385/sql-server-add-auto-increment-primary-key-to-existi...
Assume that you use In-Memory OLTP in Microsoft SQL Server 2016. When you use theALTER TABLE,ADD CONSTRAINT, orPRIMARY KEYstatement to add a primary key for a memory-optimized table, even if the table already contains a ...
EXEC ('CREATETABLESchemaName.TableName(col1intnotnullCONSTRAINTPK_col1 PRIMARYKEYCLUSTERED (col1) )') at LinkedServerName; EXEC ('INSERTINTOSchemaName.TableNameVALUES(1),(2),(3)') at LinkedServerName; 使用四部分名称查询数据: SQL SELECT*FROMLinkedServerName.DatabaseName.SchemaName....
Server: Msg 1750, Level 16, State 1, Line 1 Could not create constraint. See previous errors. Solution/Workaround: To avoid this error, you have to first create the PRIMARY KEY constraint in the table to be referenced in a FOREIGN KEY constraint. ...
on Oracle contains a column that's named 'KEY', and this column is also the primary key of the table. In this situation, when you use the Change Data Capture Designer for Oracle by Attunity to ...
原因:要插入 job 表的数据中外键列的值有问题,userId 字段的值在 user 表中找不到。 解决: 确保 job 表中要引用的外键值在 user 表中有对应数据就可以了。 “ you're adding a foreign key, you need to make sure that the data in the child table already exists in the parent table . ”...
Bug #53756 ALTER TABLE ADD PRIMARY KEY affects crash recovery Submitted: 18 May 2010 16:49Modified: 15 Feb 2011 6:48 Reporter: Ingo Strüwing Email Updates: Status: Closed Impact on me: None Category: MySQL Server: InnoDB storage engineSeverity: S2 (Serious) Version: 5.1, 5.6.99OS: ...