How do I drop all constraints in a table?

How do I drop all constraints in a table?

Easy way is use sp_help tablename. All constraints will be listed. Then use ALTER TABLE DROP CONSTRAINT to drop them. Use EnterpriseManager to drop all constarints at once.

How do I drop a constraint in SQL?

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;

How can we add or drop constraint 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 drop a table in SQL Server with Cascade constraints?

In SQL Server Management Studio, go to Options / SQL Server Object Explorer / Scripting, and enable 'Generate script for dependent objects'. Then right click the table, script > drop to > new query window and it will generate it for you.

How can I see all constraints on a table in SQL Server?

Columns

1. table_view - table or view schema and name.
2. object_type - object type: Table. View.
3. constraint_type - type of constraint: Primary key. Unique key. Foregin key. ...
4. constraint_name - name of constraint or index.
5. details - details of this constraint: Primary key - PK column(s) Unique key - UK column(s)

How do you drop a unique constraint in SQL?

To delete a unique constraint using Table Designer

1. In Object Explorer, right-click the table with the unique constraint, and click Design.
2. On the Table Designer menu, click Indexes/Keys.
3. In the Indexes/Keys dialog box, select the unique key in the Selected Primary/Unique Key and Index list.
4. Click Delete.

How do you remove constraints?

Using SQL Server Management Studio

1. In Object Explorer, expand the table with the check constraint.
2. Expand Constraints.
3. Right-click the constraint and click Delete.
4. In the Delete Object dialog box, click OK.

What does DROP TABLE cascade constraints do?

If you specify DROP TABLE orders CASCADE, Advanced Server will drop the orders table and the items table. If you specify DROP TABLE orders CASCADE CONSTRAINTS, Advanced Server will drop the orders table and remove the foreign key specification from the items table, but not drop the items table.

How do you Drop a table in SQL?

• Select the database from the left menu. Select a table from the list in the left menu or in the center box. Select Drop from the center row of the table you want to delete. Drop is SQL-speak for delete. Confirm in the popup box that appears.

How do I drop primary key in SQL Server?

• The primary key in SQL can be dropped by using the ALTER TABLE command with DROP PRIMARY KEY keyword in MySQL and DROP CONSTRAINT keyword in SQL Server or Oracle databases.

What is a drop table in SQL?

• The SQL DROP TABLE statement is used to remove a table definition and all the data, indexes, triggers, constraints and permission specifications for that table.

What is unique key in SQL Server?

• Unique Key in SQL. A unique key is a set of one or more than one fields/columns of a table that uniquely identify a record in a database table. You can say that it is little like primary key but it can accept only one null value and it cannot have duplicate values. The unique key and primary key both provide a guarantee for uniqueness...