以下SQL语句可以查询特定表的所有唯一性约束的详细信息: SELECT CONSTRAINT_NAME, COLUMN_NAME FROM all_cons_columns WHERE TABLE_NAME = 'EMPLOYEES' AND CONSTRAINT_NAME IN ( SELECT CONSTRAINT_NAME FROM all_constraints WHERE TABLE_NAME = 'EMPLOYEES' AND CONSTRAINT_TYPE = 'U'); 该语句将返回所有属于EMP...
Theuser_constraintsare utilized to display the names of the constraints in the database. Theall_constraintsprovides the metadata about all constraints that are accessible to the current user, regardless of the schema. Commonly Used Constraints in Oracle SQL Most commonly used constraints in Oracle SQ...
DEFERRABLE: NOT DEFERRABLE DEFERRED: IMMEDIATE VALIDATED: VALIDATED GENERATED: NULL BAD: NULL RELY: NULL LAST_CHANGE: NULL INDEX_OWNER: oceanbase INDEX_NAME: idx_transfer_partition_key INVALID: NULL VIEW_RELATED: NULL 2 rows in set 相关视图或文档 USER_CONSTRAINTS DBA_CONSTRAINTS 上一篇 ...
SQL> select CONSTRAINT_NAME,INDEX_NAME,CONSTRAINT_TYPE,table_name from user_constraints where CONSTRAINT_NAME='PK_DEPT'; How to check the primary key in the table SQL> select CONSTRAINT_NAME C_NAME,INDEX_NAME,CONSTRAINT_TYPE from user_constraints where TABLE_NAME='EMP' and CONSTRAINT_TYPE='P...
https://www.runoob.com/sql/sql-wildcards.html SQL 快速参考 https://www.runoob.com/sql/sql-quickref.html SQL 视图(Views) https://www.runoob.com/sql/sql-view.html SQL 约束(Constraints) https://www.runoob.com/sql/sql-constraints.html ...
See Also:constraintsinOracle Database SQL Language Reference LAST_CHANGE DATE When the constraint was last enabled or disabled INDEX_OWNER VARCHAR2(128) Name of the user owning the index INDEX_NAME VARCHAR2(128) Name of the index (only shown for unique and primary-key constraints) ...
The code below generates two separate sets of commands: one to drop all foreign key constraints, and one to create them again. These scripts are stored in a table so that, if you drop the constraints and then disaster of some kind strikes during the create, you still have everything h...
如需資料行層級 CHECK 條件約束,請參閱sys.check_constraints (Transact-SQL)。 is_sparsebit1 = 資料行是疏鬆數據行。 如需詳細資訊,請參閱使用疏鬆資料行。 is_column_setbit1 = 資料行是資料行集。 如需詳細資訊,請參閱使用資料行集。 generated_always_typetinyint適用於:SQL Server 2016 (13....
The EAV model does not come without drawbacks: It is almost impossible to use constraints for data validation, for example. However, the most puzzling issue with the EAV model is that the transformation into a one-column-per-attribute notation is almost always done using joins—quite often one...
a) Export and Import wizard - it does not have a single-click method. I have to scroll down and choose all tables and views. Also it does not guarantee and does not provide all finer details such as exporting indexes, constraints, stored procedures etc....