User Documentation
Ispirer Capabilities - Microsoft SQL Server Migration
Pricing
This article describes identifiers in Microsoft SQL Server.
| SQL Server - Identifier Rules | |
|---|---|
| First Character | An alphabetical character, underscore (_), at sign (@) and pound sign (#) |
| Subsequent Characters | Alphanumeric characters, underscore (_), dollar sign ($), pound sign (#) and at sign (@) |
| Maximum Length | 128 characters |
| Case Sensitivity | Identifiers are case insensitive |
| Standards | ANSI SQL - $ is not allowed |
Identifiers - Differences between SQL Server and other Databases
| Database | Identifiers | First Character | Subsequent Characters | Max Length |
|---|---|---|---|---|
| Oracle | Oracle Identifiers | Not allowed: _ , @ and # | Not allowed: @ | 30 |
| IBM DB2 | IBM DB2 Identifiers | Not allowed: _ , @ and # | Not allowed: @, # and $ | 128 |
| MySQL | MySQL Identifiers | Allowed: digit Not allowed: _, @ and # | Not allowed: # and @ | 64 |
| PostgreSQL | PostgreSQL Identifiers | Not allowed: @ and # | Not allowed: # and @ | 63 |
| Sybase ASE | Sybase ASE Identifiers | No differences | No Differences | 255 |
| Sybase ASA | Sybase ASA Identifiers | Allowed: $ | No Differences | 128 |
| Informix | Informix Identifiers | Not allowed: @ and # | Not allowed: @ and # | 128 |
| Teradata | Teradata Identifiers | Allowed: $ | No differences | 30 |
| HP Neoview | HP Neoview Identifiers | Not allowed: _, @ and # | Not allowed: @, # and $ | 128 |
| Interbase/Firebird | Interbase/Firebird Identifiers | Not allowed: _, @ and # | Not allowed: @, # | 67 |
| SQL Server - Quoted Identifiers | |
|---|---|
| Quotation Marks | Double quotation marks (“”) or brackets ([]). When QUOTED_IDENTIFIER option is set to OFF, only brackets ([]) can be used to delimit identifiers (double quotation marks are used to delimit character strings) |
| Characters | Any characters except the quotation marks |
| Maximum Length | 128 characters, not including the quotation marks |
| Case Sensitivity | Case insensitive. For example, “tab 1” and “Tab 1” are considered the same |
| Notes | When QUOTED_IDENTIFIER is set to ON, SQL Server follows the SQL-92 rules for the use of double quotation marks (“) and the single quotation mark (') in SQL statements. |
Quoted Identifiers - Differences between SQL Server and other Databases
| Database | Identifiers | Quotation Marks | Characters | Case Sensitivity |
|---|---|---|---|---|
| Oracle | Oracle Quoted Identifiers | ”“ | Any except quotes | Case sensitive |
| 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 |
| Informix | Informix Quoted Identifiers | ”“ | Any including quotes | Case sensitive |
| 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 |