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Informix - Identifiers

This article describes identifiers in Informix Dynamic Server.

Identifier Rules

Informix - Identifier Rules
First Character An alphabetical character and underscore (_)
Subsequent Characters Alphanumeric characters, underscore (_) and dollar sign ($)
Maximum Length 128 characters
Case Sensitivity Identifiers are case insensitive
Standards ANSI SQL

Identifiers - Differences between Informix and other Databases

Database Identifiers First Character Subsequent Characters Max Length
Oracle Oracle Identifiers Not allowed: _ Allowed: # 30
SQL Server SQL Server Identifiers Allowed: @ and # Allowed: @ and # 128
IBM DB2 IBM DB2 Identifiers Not allowed: _ Not allowed: $ 128
MySQL MySQL Identifiers Allowed: digit
Not allowed: _
No differences 64
PostgreSQL PostgreSQL Identifiers No differences No differences 63
Sybase ASE Sybase ASE Identifiers Allowed: @ and # Allowed: @ and # 255
Sybase ASA Sybase ASA Identifiers Allowed: $, @ and # Allowed: @ and # 128
Teradata Teradata Identifiers Allowed: $ and # Allowed: # 30
HP Neoview HP Neoview Identifiers Not allowed: _ Not allowed: $ 128
Interbase/Firebird Interbase/Firebird Identifiers Not allowed: _ No differences 67

Quoted or Delimited Identifiers

Informix - Quoted Identifiers
Quotation Marks Double quotation marks (””), can't be specified for the database name
Characters Any including quotes
Maximum Length 128 characters, not including the quotation marks
Case Sensitivity Case sensitive. For example, “tab 1” and “Tab 1” are considered as different
Notes When DELIMIDENT environment variable is set, Informix follows the SQL-92 rules for the use of double quotation marks (”) and the single quotation mark (') in SQL statements.

Quoted Identifiers - Differences between Informix and other Databases

Database Identifiers Quotation Marks Characters Case Sensitivity
Oracle Oracle Quoted Identifiers ”” Any except quotes Case sensitive
SQL Server SQL Server Quoted Identifiers [] and ”” Any except quotes Case insensitive
IBM DB2 IBM DB2 Quoted Identifiers ”” Any including quotes Case sensitive
MySQL MySQL Quoted Identifiers `` and ”” Any except quotes Case sensitive
PostgreSQL PostgreSQL Quoted Identifiers ”” Any including quotes Case sensitive
Sybase ASE Sybase ASE Quoted Identifiers [] and ”” Any except pound sign (#) as the first character Case insensitive
Sybase ASA Sybase ASA Quoted Identifiers [] and ”” Any Case insensitive
Teradata Teradata Quoted Identifiers ”” Any including quotes Case insensitive
HP Neoview HP Neoview Quoted Identifiers ”” Any except at sign (@), forward slash (/),
circumflex character (^) as the first character
and space(s) as the last character(s)
Case sensitive
Interbase/Firebird Interbase/Firebird Quoted Identifiers ”” Any character except space(s) as the last character(s) Case sensitive


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sqlways/informix/identifiers.txt · Last modified: May 07, 2018, 03:15:26 PM (external edit)
 
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