How do I drop a table with constraints in SQL?

State’ — Drop the foreign key constraint by its name ALTER TABLE dbo….

  1. Select the tables you want to DROP.
  2. Select “Save to new query window”.
  3. Click on the Advanced button.
  4. Set Script DROP and CREATE to Script DROP.
  5. Set Script Foreign Keys to True.
  6. Click OK.
  7. Click Next -> Next -> Finish.
  8. View the script and then Execute.

How do you drop a constraint in Alter?

The SQL syntax to remove a constraint from a table is,

  1. ALTER TABLE “table_name” DROP [CONSTRAINT|INDEX] “CONSTRAINT_NAME”;
  2. ALTER TABLE Customer DROP INDEX Con_First;
  3. ALTER TABLE Customer DROP CONSTRAINT Con_First;
  4. ALTER TABLE Customer DROP CONSTRAINT Con_First;

Can ALTER TABLE delete constraints?

You can explicitly drop a table check constraint using the ALTER TABLE statement, or implicitly drop it as the result of a DROP TABLE statement.

What happens to constraints when table is dropped?

Dropping a table removes the table definition from the data dictionary. All rows of the table are no longer accessible. All indexes and triggers associated with a table are dropped. All views and PL/SQL program units dependent on a dropped table remain, yet become invalid (not usable).

How do you add constraints to a table?

The basic syntax of an ALTER TABLE command to ADD PRIMARY KEY constraint to a table is as follows. ALTER TABLE table_name ADD CONSTRAINT MyPrimaryKey PRIMARY KEY (column1, column2…); The basic syntax of an ALTER TABLE command to DROP CONSTRAINT from a table is as follows.

How do I drop a table in Oracle?

Oracle DROP TABLE

  1. First, indicate the table and its schema that you want to drop after the DROP TABLE clause.
  2. Second, specify CASCADE CONSTRAINTS clause to remove all referential integrity constraints which refer to primary and unique keys in the table.

How do I drop all constraints on a table?

To drop constraints, use the ALTER TABLE statement with the DROP or DROP CONSTRAINT clauses. This allows you to BIND and continue accessing the tables that contain the affected columns. The name of all unique constraints on a table can be found in the SYSCAT.

How do I drop a check constraint?

Drop a Check Constraint The syntax for dropping a check constraint in SQL Server (Transact-SQL) is: ALTER TABLE table_name DROP CONSTRAINT constraint_name; table_name. The name of the table that you wish to drop the check constraint.

When a table is dropped its indexes get dropped as well?

All rows from the table are dropped. All table indexes and domain indexes are dropped, as well as any triggers defined on the table, regardless of who created them or whose schema contains them. If table is partitioned, then any corresponding local index partitions are also dropped.

How do I drop all constraints in a table?

Procedure

  1. To explicitly drop unique constraints, use the DROP UNIQUE clause of the ALTER TABLE statement.
  2. To drop primary key constraints, use the DROP PRIMARY KEY clause of the ALTER TABLE statement.
  3. To drop (table) check constraints, use the DROP CHECK clause of the ALTER TABLE statement.

How do you add a constraint to an existing table in Oracle?

The syntax for creating a unique constraint using an ALTER TABLE statement in Oracle is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, column_n); table_name.

How to alter table in Oracle?

– You cannot specify the PCTUSED parameter for the index segment of an index-organized table. – If you attempt to alter the storage attributes of tables in locally managed tablespaces, then Oracle Database raises an error. – For segments with automatic segment-space management, the database ignores attempts to change the PCTUSED setting.

How to add and drop constraints in Oracle?

add constraint fk_cust_name FOREIGN KEY (person_name, person_gender) references person_table (person_name, person_gender) initially deferred deferrable; Here is another example of Oracle “alter table” syntax to drop constraints. ALTER TABLE cust_table drop constraint fk_cust_table_ref; Here we use Oracle “alter table” syntax to add a check constraint. alter table cust_table add constraint check_cust_types CHECK (cust_type IN ( ‘yuppie’,

How to check all constraints on a table in Oracle?

– One row represents one constraint in a specific table in a database – Scope of rows: (A) all check constraints on tables accessible to the current user in Oracle database, (B) all check constraints on tables in Oracle database – Ordered by schema name, table name, constraint name

How can drop table if table exists in Oracle?

All rows from the table are dropped.

  • All table indexes and domain indexes are dropped,as well as any triggers defined on the table,regardless of who created them or whose schema contains them.
  • All the storage tables of nested tables and LOBs of table are dropped.