DELETE DATABASE is used with the DELETETABLES option to remove the database and its friends table from disk. 复制 CLOSE ALL CREATE DATABASE people CREATE TABLE friends (FirstName C(20), LastName C(20)) CLEAR DISPLAY TABLES && Displays tables in the database DISPLAY DATABASES && Displays ...
In Amazon QLDB, use the DELETE command to mark an active document as deleted in a table by creating a new, but final revision of the document. This final revision indicates that the document is deleted. This operation ends the lifecycle of a document, wh
User A executes the following command to drop a large table in your database: SQL> DROP TABLE trans; While the drop table operation is in progress; user B executes the following command on the same table; SQL> DELETE FROM trans WHERE tr_type='SL'; Which statement is true regarding the...
To delete the chosen database, use the following command: DROP DATABASE database_name; Again, replace database_name with the name of the database you want to delete. Once you execute this command, the database will be permanently removed from your MySQL server. Bonus: If you want to ...
ALTER TABLE 'content_cat' DROP INDEX 'cat_id' The above command will remove the unique index associated withcat_idfield ofcontent_cattable We can also use DROP command to delete a complete database. Here is the sample code DROP DATABASE TEST ...
Dropping a Database Deleting a database from your system is called “dropping”. The word delete usually refers toremoving rows from a table, and “dropping” is deleting or removing an object, such as a table, or even a database. ...
DELETE FROM [DatabaseName!]TableName [WHERE FilterCondition1 [AND | OR FilterCondition2 ...]] Parameters FROM [DatabaseName!]TableName Specifies the table in which records are marked for deletion. DatabaseName!specifies the name of a non-current database containing the table. You must includ...
CLOSE DATABASES SET PATH TO (HOME(2) + 'data\') && Sets path to database MODIFY DATABASE testdata && Open testdata database See Also ADD TABLE | CLOSE DATABASES | CREATE DATABASE | DBC( ) | DBGETPROP( ) | DBSETPROP( ) | DELETE DATABASE | DISPLAY TABLES | OPEN DATABASE | RE...
SELECT tablespace_name FROM all_tables WHERE table_name = 'YOURTABLENAME'; 18 How to remove duplicate rows from a table If the unique/primary keys can be identified from the table, it is easier to remove the records from the table using the following query: DELETE FROM tablename WHERE row...
CREATE TABLE CUSTOMERS( ID INT NOT NULL, NAME VARCHAR (20) NOT NULL, AGE INT NOT NULL, ADDRESS CHAR (25), SALARY DECIMAL (18, 2), PRIMARY KEY (ID) ); Let us first verify the CUSTOMERS table using the DESC command then we will delete it from the database −DESC Table If...