Example 7: How to add foreign key Constraints using alter command Now if we want to add aforeign key constraintin table Marks named'fk_roll_num'for the column roll_number' .we do like this ALTERTABLEMarksADDConstraint'fk_roll_num FOREIGN KEY (roll_number) REFERENCES Students (roll_number)...
其行为类似于FOR SHARE,只是锁较弱:SELECT FOR UPDATE被阻止,而不是SELECT FOR NO KEY UPDATE。键共享锁会阻塞其他事务执行修改键值的DELETE或者UPDATE,但不会阻塞其他UPDATE,也不会阻止SELECT FOR NO KEY UPDATE、SELECT FOR SHARE或者SELECT FOR KEY SHARE。 5、行级锁冲突 要求的锁模式 当前的锁模式 FOR KEY ...
create table 【数据名.】表名( 字段名1 数据类型 primary key , 字段名2 数据类型 【unique key】 【not null】, ..., foreign key (从表字段) references 主表名(主表字段) 【on update 外键约束等级】【on delete 外键约束等级【 #外键只能在所有字段列表后面单独指定 ); create table 【数据名.】表...
This section describes meta-commands provided by gsql after the GaussDB(DWS) database CLI tool is used to connect to a database. A gsql meta-command can be anything that
This section describes meta-commands provided by gsql after the GaussDB database CLI tool is used to connect to a database. A gsql meta-command can be anything that you e
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Specifies that when the foreign key in a child table is set to NULL because of the ON DELETE SET NULL rule, the UPDATE operation is not replicated. Use this option to avoid duplicate UPDATE operations when ON DELETE SET NULL is already being used at the target database. If you use this...
If the -offlineMigration command included the ‑singleDataFile keyword, the mtk_hr_data.sql script will contain the commands required to re-create all of the objects in the new target database. Populate the database with the command: → WrapCopy acctg=# \i ./mtk_hr_data.sql Import opti...
Add multiple location paths into the web.config Add new column in existing CSV file using C# Add query string when user clicks back button Add Reference Issue Add rows to a Table in run time , one by one Add Trusted Site in the IIS server Adding .ASHX files to an existing Project......
}returnsqls; } 开发者ID:Anupam-,项目名称:Ilaro.Admin,代码行数:23,代码来源:RecordsDeleter.cs 示例3: GetSetToNullUpdateSql ▲点赞 3▼ privatestringGetSetToNullUpdateSql(DbCommand cmd, Entity entity, RecordHierarchy subRecord){// {0} - Foreign table// {1} - Foreign key// {2} - Primar...