#ORACLE DATABASE LATEST VERSION CODE#

The mechanism also allows Oracle error codes and American National Standards Institute (ANSI) SQLSTATES to be translated by user-supplied code. The name of the translator is specified at connect time.

It can be implemented programmatically, by look-up, or by a suitable mixture of these.

#ORACLE DATABASE LATEST VERSION CODE#

The translation code is named and installed in the database using a PL/SQL API. These new keywords provide easier and more flexible ways to evaluate and return SQL query results.ДЄ new mechanism is provided to allow the text of a SQL statement, submitted from a client program using an open application programming interface (API) such as ODBC or JDBC, to be translated by user-supplied code before it is submitted to the Oracle Database SQL compiler. LATERAL, part of the ANSI standard, is an extension of the inline view syntax that provides left-correlation scoping within the inline view. OUTER APPLY returns both rows that produce a result set, and rows that do not, with NULL values in the columns produced by the table-valued function. CROSS APPLY returns only rows from the outer table that produce a result set from the table-valued function. There are two forms of APPLY - CROSS APPLY and OUTER APPLY. Therefore, one can pass left-correlations to the table-valued functions. The right input is evaluated for each row from the left input and the rows produced are combined for the final output. The table-valued function acts as the right input the outer table expression acts as the left input. The APPLY SQL syntax allows a table-valued function to be invoked for each row returned by a query's outer table expression. In particular, the extended flexibility of the table operator allows code written to run other vendors' stored procedure languages to be easily migrated to PL/SQL.Дў.1.6.10 SQL CROSS APPLY, OUTER APPLY and LATERAL The removal of these restrictions increases the power of expression and the usefulness of PL/SQL. (In prior releases, the collection's data type had to be declared at the schema level.) This also allows the data type to be a PL/SQL associative array. The table operator can now be used in a PL/SQL program on a collection whose data type is declared in PL/SQL. For example, a PL/SQL subprogram with a formal parameter whose data type is BOOLEAN can now be invoked dynamically using an anonymous block. This restriction is removed in Oracle Database 12 c Release 1 (12.1). This restriction applied even when the called SQL was a PL/SQL anonymous block. Through Oracle Database 11 g Release 2 (11.2), when PL/SQL invoked SQL, only values with data types supported by SQL could be bound.

It relieves the application developers from the burden of formulating their queries in terms of views or LEFT OUTER JOIN syntax.Дў.1.4.12 PL/SQL-Specific Data Types Allowed Across the PL/SQL-to-SQL Interface These views are merged in a heuristic manner without having to go through cost-based query transformation. Merging of such views allows more join reordering and, therefore, more optimal execution plans.

Such views can originate from the user query or they may be generated during conversion from LEFT OUTER JOIN syntax. Merging of multiple table views on the left hand side of an outer join. This expansion provides the following benefits: In Oracle Database 12 c, the native syntax for a LEFT OUTER JOIN has been expanded to allow multiple tables on the left hand side. The only way to execute such a query was to translate it into ANSI syntax. Prior to Oracle Database 12 c, having multiple tables on the left hand side of an outer join was illegal and resulted in an ORA-01417 error. Beginning with Oracle Database 12 c, a single table can be the null-generated table for multiple tables. In previous releases of Oracle Database, in a query that performed outer joins of more than two pairs of tables, a single table could be the null-generated table for only one other table. 2.1.4.3 Enhanced Oracle Native LEFT OUTER JOIN Syntax

Oracle database latest version