SQLite Autoincrement
SQLite isAUTOINCREMENT is a keyword for the field value in the table is automatically incremented.We can useAUTOINCREMENT keyword automatically increase the value of a field when you create a table on a specific column names.
KeywordAUTOINCREMENT only be used for integer (INTEGER) field.
grammar
Basic usageAUTOINCREMENT keyword is as follows:
CREATE TABLE table_name ( column1 INTEGER AUTOINCREMENT, column2 datatype, column3 datatype, ..... columnN datatype, );
Examples
Suppose you want to create COMPANY table is as follows:
sqlite> CREATE TABLE COMPANY ( ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR (50), SALARY REAL );
Now, to the COMPANY table insert the following records:
INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'Paul', 32, 'California', 20000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'Allen', 25, 'Texas', 15000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'Teddy', 23, 'Norway', 20000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'Mark', 25, 'Rich-Mond', 65000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'David', 27, 'Texas', 85000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'Kim', 22, 'South-Hall', 45000.00); INSERT INTO COMPANY (NAME, AGE, ADDRESS, SALARY) VALUES ( 'James', 24, 'Houston', 10000.00);
This will insert COMPANY Table 7 yuan group, the recording COMPANY table is as follows:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 1 Paul 32 California 20000.0 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0 7 James 24 Houston 10000.0