Oracle Functions

All functions are evaluated by the Sybase database after the gateway has converted them to Sybase SQL.

Functions Not Supported by Sybase

Oracle SQL functions with no equivalent function in Sybase are not supported in DELETE, INSERT, or UPDATE statements, but are evaluated by the Oracle database if the statement is a SELECT statement.

That is, the Oracle database performs post-processing of SELECT statements sent to the gateway.

If an unsupported function is used in a DELETE, INSERT, or UPDATE, statement, the following Oracle error occurs:

ORA-02070: database db_link_name does not support function in this context

Functions Supported by Sybase

The gateway translates the following Oracle database functions in SQL statements to their equivalent Sybase functions.

Arithmetic Operators

Arithmetic operators suppoted by Oracle Database Gateway for Sybase.

Oracle	Sybase
`+`	`+`
`-`	`-`
`*`	`*`
`/`	`/`

Comparison Operators

Comparison operators supported by Oracle Database Gateway for Sybase.

Oracle	Sybase
`=`	`=`
`>`	`>`
`<`	`<`
`>=`	`>=`
`<=`	`<=`
`<>`, `!=`, `^=`	`<>`, `!=`
`IS NOT NULL`	`IS NOT NULL`
`IS NULL`	`IS NULL`

Group Functions

Group functions supported by Oracle Database Gateway for Sybase.

Oracle	Sybase
`AVG`	`AVG`
`COUNT`	`COUNT`
`MAX`	`MAX`
`MIN`	`MIN`
`SUM`	`SUM`

String Functions

String functions supported by Oracle Database Gateway for Sybase.

Oracle	Sybase
`\|\|`	+ `(expression1` `+` `expression2)`
`ASCII`	`ASCII`
`CHR`	`CHAR`
`INSTR`	`CHARINDEX`
`LENGTH`	`CHAR_LENGTH`
`LOWER`	`LOWER`
`SUBSTR` (second argument cannot be a negative number)	`SUBSTRING`
`UPPER`	`UPPER`

Other Functions

Other functions supported by Oracle Database Gateway for Sybase.

Oracle	Sybase
`ABS`	`ABS`
`CEIL`	`CEILING`
`COS`	`COS`
`EXP`	`EXP`
`FLOOR`	`FLOOR`
`LN`	`LOG`
`LOG`	`LOG10`
`MOD`	`%`
`NOT` `NVL`	`IS NOT NULL`
`NVL`	`IS NULL`
`POWER`	`POWER`
`ROUND`	`ROUND`
`SIN`	`SIN`
`SQRT`	`SQRT`
`TAN`	`TAN`