Oracle ( ) Notation vs. ANSI JOIN: Which Should You Use?

Oracle ( ) Notation vs. ANSI JOIN: Key Differences and Considerations

In SQL, Oracle's ( ) symbol and ANSI standard JOIN symbol are both used to perform join operations. Although their purpose is the same, there are some key differences between the two methods.

Restrictions and syntax:

( ) notation has some limitations that the ANSI JOIN syntax does not have. For example, it cannot be used in queries that also contain the FROM clause JOIN syntax, nor can it be applied to tables joined by multiple conditions. Additionally, it does not allow outer joins to more than two pairs of tables.

Performance impact:

There is no significant difference in performance between the two symbols. Oracle recommends using ANSI JOIN syntax in new code because it is compliant and does not have these limitations.

DEPRECATED:

( ) notation is not officially deprecated by Oracle, but is considered legacy syntax. It is recommended to avoid its use in new code and use ANSI JOIN syntax instead.

Oracle’s suggestion:

Oracle strongly recommends using ANSI JOIN syntax instead of the ( ) notation. The ( ) notation has limitations and limitations that can hinder the readability and maintainability of SQL code.

Summary:

While the ( ) notation can still be used in older code, it is best to use ANSI JOIN syntax in new code development. ANSI JOIN syntax provides a more consistent and standards-compliant approach that avoids the limitations and limitations associated with the ( ) notation.

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