PostgreSQL supports SERIAL data type that allows you to automatically generate IDs. SQL Server supports IDENTITY property and allows you to specify the increment: Note that a trigger is required as Oracle does not allow using NEXTVAL in DEFAULT clause for a column. Oracle does not support AUTO_INCREMENT (IDENTITY) property on a column, but this functionality can be implemented using a sequence and a trigger:ĬREATE SEQUENCE airlines_seq START WITH 100 INCREMENT BY 1 ĬREATE OR REPLACE TRIGGER airlines_seq_tr Then new IDs with start from this value + 1ĪLTER TABLE table_name AUTO_INCREMENT = new_start_value If a value larger than the current max ID value is explicitly inserted, LAST_INSERT_ID returns ID for the first successfully inserted row in multi-row INSERT LAST_INSERT_ID returns the last value inserted in the current session DOUBLE and FLOAT are allowed but deprecated. Omit the AUTO_INCREMENT column in INSERT, or specify NULL or 0ĭata type of column must be an integer. Get generated ID SELECT LAST_INSERT_ID ( ) Insert a row, ID will be automatically generated INSERT INTO airlines (name ) VALUES ( 'United Airlines' ) Name VARCHAR (90 ) ) AUTO_INCREMENT = 100 Quick Example: - Define a table with an auto-increment column (id starts at 100) CREATE TABLE airlines The example is lack of insert_id in multi_query.AUTO_INCREMENT option allows you to automatically generate unique integer numbers (IDs, identity, sequence) for a column. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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