![]() You can use the SQLite ALTER TABLE statement to add a new column to an existing table. Try It Using SQLite ALTER TABLE to add a new column to a table SELECT name,Įquipment Code language: SQL (Structured Query Language) ( sql ) Third, query data from the equipment table to verify the RENAME operation. RENAME TO equipment Code language: SQL (Structured Query Language) ( sql ) Second, use the ALTER TABLE RENAME TO statement to change the devices table to equipment table as follows: ALTER TABLE devices VALUES( 'HP ZBook 17 G3 Mobile Workstation', 'ZBook', 'SN-2015') Code language: SQL (Structured Query Language) ( sql ) INSERT INTO devices ( name, model, serial) Let’s take an example of renaming a table.įirst, create a table named devices that has three columns: name, model, serial and insert a new row into the devices table. If a table is referenced by views or statements in triggers, you must manually change the definition of views and triggers.The database objects such as indexes and triggers associated with the table will be associated with the new table.You cannot use it to move the table between the attached databases. The ALTER TABLE only renames a table within a database.These are important points you should know before you rename a table: RENAME TO new_table Code language: SQL (Structured Query Language) ( sql ) To rename a table, you use the following ALTER TABLE RENAME TO statement: ALTER TABLE existing_table Using SQLite ALTER TABLE to rename a table Rename a column (added supported in version 3.20.0).Unlike SQL-standard and other database systems, SQLite supports a very limited functionality of the ALTER TABLE statement.īy using an SQLite ALTER TABLE statement, you can perform two actions: Here, the SQL command renames the Customers table to New_customers.Summary: in this tutorial, you will learn how to use SQLite ALTER TABLE statement to change the structure of an existing table. For example, - rename Customers table to New_customers We can change the name of a table using the ALTER TABLE command with the RENAME clause. Here, the SQL command removes the country column from the Customers table. For example, - delete country column from Customers table We can also drop (remove) columns in a table using the ALTER TABLE command with the DROP clause. ![]() Note: This command is not supported by SQLite. Here, the SQL command changes the data type of the age column to VARCHAR in the Customers table. We can also change the column's data type using the ALTER TABLE command with MODIFY or ALTER COLUMN clause. Here, the SQL command changes the column name of customer_id to c_id in the Customers table. For example, - rename column customer_id to c_id We can rename columns in a table using the ALTER TABLE command with the RENAME COLUMN clause. However, many other database management systems support this command. Note: Since our compiler uses SQLite, it does not support adding multiple columns with ALTER TABLE. Here, the SQL command adds the phone and age columns to the Customers table. For example, - add phone and age columns to Customers table We can also add multiple columns at once to a table. For example, - add phone column to Customers table We can add columns in a table using the ALTER TABLE command with the ADD clause. We can perform the following operations on a table using the ALTER TABLE command: supporting_codes are the codes supporting the clause.clause gives further information on how the table is to be altered like ADD, RENAME COLUMN, etc.table_name is the name of the table to be modified.The syntax of the SQL ALTER TABLE statement is: ALTER TABLE table_name Here, the SQL command adds a column named phone to the Customers table. Example - add phone column to Customers table In SQL, the ALTER TABLE command is used to modify the structure of an existing table like adding, deleting, renaming columns, etc.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |