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...
Understanding Numerical Data Types in SQL Comparing TRUNCATE TABLE, DELETE, and DROP TABLE in SQL What Is the DELETE Statement in SQL? See also: How to Remove a Primary Key in SQL How to remove a unique constraint in SQL? How to Delete a Column in SQL How to Delete a Foreign Key Con...
SQL Copy Here we get the constraints name that we have created. Now we are able to drop the constraints by using the above name. alter table STUDENT_DETAILS drop constraint DF__STUDENT_D__IS_RE__3846C6FF SQL Copy Now we are able to drop the column by using the below query. alter ...
When designing an SQL database, there may be cases where you want to impose restrictions on what data can be added to certain columns in a table. SQL makes this possible through the use ofconstraints. After applying a constraint to a column or table, any attempts to add data to the colu...
CONSTRAINT fk_ownerID FOREIGN KEY(ownerID)REFERENCES clubMembers(memberID) ); Copy Note that this example provides a name for the foreign key constraint,fk_ownerID. MySQL will automatically generate a name for any constraint you add, but defining one here will be useful when we need to refere...
1. Using SQL Query: Having some foreign key constraints might prevent you from executing drop table, so the first thing you should do is to temporarily disable all the foreign key constraints in order for the drop statements work: SET FOREIGN_KEY_CHECKS = 0; ...
In this example, you need to drop the foreign key constraints before truncating the main table and then recreate them afterward. Example 3: TRUNCATE with Identity ColumnsIf your table has an identity column (auto-incrementing), the identity value will be reset after truncating the table: ...
Introduction to Oracle DROP VIEW statement To remove a view from the database, you use the following DROP VIEW statement: DROP VIEW schema_name.view_name [CASCADE CONSTRAINT];Code language: SQL (Structured Query Language) (sql) 1) schema_name First, you specify the name of the schema that...
#Add Unique Constraint and Copy Unique Rows to Original Table To make sure there are no duplicates added in future, we can extend the previous set of queries to add aUNIQUEconstraint to the column. # Step1:CopydistinctvaluestotemporarytableCREATETEMPORARYTABLEtmp_user (SELECTid, nameFROMuserGROU...
Drop constraint in Oracle: We can drop the constraint in Oracle using the alter table command. we can drop primary, foreign key, check, not null and unique constraint with the same command Coalesce Function in Oracle: The Coalesce function in Oracle will return the first expression if it is...