Unlike SQL-standard and other database systems, SQLite supports a very limited functionality of the ALTER TABLE statement. By using an SQLite ALTER TABLE statement, you can perform two actions: Rename a table. Add a new column to a table. SQLite ALTER TABLE – Renaming a table. To rename a table, you use the following ALTER TABLE RENAME TO statement. The sqlite function creates an sqlite object. Alternative Functionality. Instead of the sqlite object, the connection object enables you to connect to various relational databases using ODBC and JDBC drivers that you install and administer. You can create the connection object by using the database function. The sqlite object provides limited Database Toolbox™ functionality.
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- Manage tables: create, delete, rename, reindex.
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Cara Instal :
- Download dan ekstrak file “SQLite Expert Professional Full Version” ini.
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32 Bit : SQLite Expert Professional 5.3.4.463 Full Version (41 Mb)
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32 Bit : SQLite Expert Professional 5.3.4.463 Full Version (41 Mb)
64 Bit : SQLite Expert Professional 5.3.4.463 Full Version (43 Mb)
Summary: in this tutorial, you will learn about SQLite
AUTOINCREMENT
column attribute and when to use it in your table.Introduction to SQLite ROWID
table
Whenever you create a table without specifying the
WITHOUT ROWID
option, you get an implicit auto-increment column called rowid
. The rowid
column store 64-bit signed integer that uniquely identifies a row in the table.Let’s see the following example.
First, create a new table named
people
that has two columns: first_name,
and last_name
:2 | VALUES('John','Doe'); |
Third, query data from the
people
table using the following SELECT
statement:2 4 6 | rowid, last_name people; |
As you can see clearly from the output, SQLite implicitly creates a column named
rowid
and automatically assigns an integer value whenever you insert a new row into the table.Note that you can also refer to the
rowid
column using its aliases: _rowid_
and oid
.When you create a table that has an
INTEGER PRIMARY KEY
column, this column is the alias of the rowid
column.The following statement drops table
people
and recreates it. This time, however, we add another column named person_id
whose data type is INTEGER
and column constraint is PRIMARY KEY
:2 | VALUES(9223372036854775807,'Johnathan','Smith'); |
Second, insert another row without specifying a value for the
person_id
column:2 | VALUES('William','Gate'); |
![Serial Serial](https://www.rarst.net/images/SQLiteExpertPersonallightdatabasemanager_14FD5/sqliteexpert_interface.png)
As clearly shown in the output, the new row received an unused integer.
Consider another example.
First, create a new table named
t1
that has one column:Second, insert some rows into the
t1
table:![Sqlite Sqlite](https://i1.wp.com/softwarespatch.com/wp-content/uploads/2017/09/SQLite-Expert-Professional-5.1.2.140-Patch-Serial-Key-Download.png?resize=500%2C287)
2 4 | INSERTINTOt1(c)values('B'); INSERTINTOt1(c)values('D'); |
Third, query data from the
t1
table:Fourth, delete all rows of the
t1
table:Fifth, insert some rows into the
t1
table:2 | INSERTINTOt1(c)values('F'); |
Finally, query data from the
t1
table:As you can see, the rowid 1, 2 and 3 have been reused for the new rows.
SQLite AUTOINCREMENT
column attribute
SQLite recommends that you should not use
AUTOINCREMENT
attribute because:The
AUTOINCREMENT
keyword imposes extra CPU, memory, disk space, and disk I/O overhead and should be avoided if not strictly needed. It is usually not needed.In addition, the way SQLite assigns a value for the
AUTOINCREMENT
column slightly different from the way it does for the rowid
column.Consider the following example.
First, drop and recreate the
people
table. This time, we use AUTOINCREMENT
attribute column:2 | VALUES(9223372036854775807,'Johnathan','Smith'); |
Third, insert another row into the
people
table.2 | VALUES('John','Smith'); |
This time, SQLite issued an error message because the
person_id
column did not reuse the number like a rowid
column.When should you use the
AUTOINCREMENT
column attribute?The main purpose of using attribute
AUTOINCREMENT
is to prevent SQLite to reuse a value that has not been used or a value from the previously deleted row.If you don’t have any requirement like this, you should not use the
AUTOINCREMENT
attribute in the primary key.In this tutorial, you have learned how SQLite
AUTOINCREMENT
attribute works and how it influences the way SQLite assigns values to the primary key column.- Was this tutorial helpful ?