android sqlite copy updates database tutorial

Android sqlite copy updates database tutorial how to#
Android sqlite copy updates database tutorial serial#

The new column cannot have a default of CURRENT_TIMESTAMP, CURRENT_DATE, and CURRENT_TIME, or an expression.If the new column has a NOT NULL constraint, you must specify a default value for the column other than a NULL value.The new column cannot have a UNIQUE or PRIMARY KEY constraint.There are some restrictions on the new column: The following illustrates the syntax of ALTER TABLE ADD COLUMN statement: ALTER TABLE table_nameĪDD COLUMN column_definition Code language: SQL (Structured Query Language) ( sql ) In this scenario, SQLite appends the new column at the end of the existing column list. 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)

Android sqlite copy updates database tutorial 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:

Android sqlite copy updates database tutorial how to#

Summary: in this tutorial, you will learn how to use SQLite ALTER TABLE statement to change the structure of an existing table.