Third, if a view has any constraint, you must specify the CASCADE CONSTRAINT clause to drop all referential integrity constraints that refer to primary key and unique keys in the view. If you don’t do so, then the DROP VIEW statement will fail in case such constraints exist. Oracle DROP...
We can use the view according to the access we have to the Oracle database. Now I am going to explain how to check all constraints on a table in Oracle using the examples Table of Contents How to find all constraints on a table in oracle How to find constraint by name in Oracle How...
The DROP TABLE command might be used to delete a table stored in an SQL database. We can also delete multiple tables in SQL simultaneously if needed. This can be done with the help of a single DROP command followed by the names of the tables separated by commas that need to be deleted...
Create a constraint that refers to the table. You cannot grant this privilege to a role. SELECT Query the table with the SELECT statement. UPDATE Change data in the table with the UPDATE statement. Note: You must grant the SELECT privilege on the table along with the UPDATE privilege...
SQL> drop table dept; drop table dept * ERROR at line 1: ORA-02449: unique/primary keys in table referenced by foreign keys SQL> SQL> drop table dept cascade constraints; Table dropped. How to drop multiple tables in oracle There might be a requirement to drop multiple tables in a singl...
You can't alter the criteria for a constraint in Oracle Database. To change it you must drop and recreate the constraint. Learn how to do this process online for check constraints, not null, unique constraints, primary keys, and foreign keys.
Now that we know what exactly a table in Oracle is, we will see how to create a table in the Oracle database. Let us look into the syntax for creating a table in Oracle. Syntax: CREATE TABLE table_name ( column1 datatype [constraint], ...
Add a new columnc2and make it a unique key with theUNIQUEclause: ALTER TABLE t1 ADD c2 int UNIQUE; As the output in Figure 5 indicates, the unique key gets added. Figure 5. Adding a new column as unique key Add a constraint to a column ...
NOTE: A primary key (PK) is a constraint. Each set of values in its columns can only appear once. So you can't have duplicates. It also has a not null constraint. And creates a unique index in the background.To create one, add the organization index clause to the table definit...
[A]MySQL.Data.MySqlClient.MySqlConnection cannot be cast to [B]MySQL.Data.MySqlClient.MySqlConnection. [C#] How to make the Console Process delay [C#] Oracle.DataAccess issue - Unhandled exception of type System.TypeInitializationException occured in mscorlib.dll [C#] Regex - Best Validation of...