The DROP TABLE command in SQL Server effectively removes the entire table from the database, including its structure, all stored data, indexes, triggers, and constraints. The basic syntax of the DROP TABLE command is: DROP TABLE table_name; ...
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.INDEXES system catalog view. Proc...
The SQL Server Native Client OLE DB provider exposes some SQL Server PRIMARY KEY and UNIQUE constraints as indexes. The table owner, database owner, and some administrative role members can modify a SQL Server table, dropping a constraint. By default, only the table owner can drop an existing...
This statement in SQLite allows a user to rename a table or to add a new column to an existing table. It is not possible to rename a column, remove a column, or add or remove constraints from a table. sqlite> CREATE TABLE Names(Id INTEGER, Name TEXT); ...
or they may not realize that there are check constraints defined on their table. In general it's a good principle that dropping (or adding) a feature should never affect the logical state of a table, only the physical state of a table. For example: Dropping the DV feature does not undel...
The query above is missing Unique and Primary Key constraints exclusions and you can break your application if you don’t filter out “unused” indexes that are also Unique and Primary Key constraints. Make sure you always use the filter above when you check unused indexes. ...
I have discussed the case of dropping a default on a column in this post, however, in a case where you are facing problems dealing with column specific constraints(especially dropping), the appraoch I suggest below should help you with that. ...
[root@siddhant ~]# pt-online-schema-change --user=root --execute --set-vars=foreign_key_checks=0 --alter-foreign-keys-method=rebuild_constraints --alter="DROP FOREIGN KEY _FKID" D=apps02,t=test3 --socket=/tmp/mysql-master5520.sock Operation, tries, wait: analyze_table, 10, 1 copy...
cascade the drop of the FOREIGN KEY constraints in the child tables. TO CREATE TABLESPACE +++++++++++++ To create a new tablespace, use the SQL statement CREATE TABLESPACE. You must have the CREATE TABLESPACE system privilege to create a tablespace. As an example, let’s create the tables...
All referential constraints in which the table is a parent or dependent are dropped. All packages and cached dynamic SQL and XQuery statements dependent on the dropped table are marked invalid, and remain so until the dependent objects are re-created. This includes packages dependent on any super...