Cursor for updating table in sql oracle

23-Apr-2019 16:48

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This DATENAME() function returns a character string that represents a part of a given date and time value.

That makes it extremely popular in large companies.

Oracle is one of the most powerful and complex software packages.

Oracle 9i now enables us to bulk fetch from Native Dynamic SQL statements.

Prior to 9i we had DBMS_SQL (with its reasonably complex, low-level interface) or NDS workarounds using dynamic PL/SQL. In the following example, we will simulate a process whereby we fetch a collection of keys from a table based on a different set of criteria passed in as a parameter (our parameter in this case will be represented by a sqlplus variable).

DECLARE 2 3 TYPE typ_aa_object IS TABLE OF user_objects%ROWTYPE 4 INDEX BY PLS_INTEGER; 5 aa_objects typ_aa_object; 6 7 v_predicates VARCHAR2(256) := :where_clause; 8 9 BEGIN 10 11 /* Execute the statement and bulk fetch the results... COUNT

This meant that many types needed to be declared and many index-by tables or collections maintained, which could be very code-intensive.*/ 19 FETCH cv BULK COLLECT INTO aa_objects; 20 21 /* 22 * Not passing the ref cursor to a client 23 * in this example so close it... Until 9i, we could only BULK COLLECT columns of scalar types or single instances of object types (i.e. In keeping with 9i's extended support for record-based operations, we can now BULK COLLECT a collection of records stored in a table into either an associative array or collection variable.In the following example we are going to denormalise the way we store information on our tables and columns.Result of all the 3 queries is same: SELECT DATENAME(year, getdate()) AS 'This is year' SELECT DATENAME(yyyy, getdate()) AS 'This is year' SELECT DATENAME(yy, getdate()) AS 'This is year' Result: This is year 2017 DATENAME Example 6 Below query finds current timezone.Now, Oracle is one of the most sophisticated database management systems.

This meant that many types needed to be declared and many index-by tables or collections maintained, which could be very code-intensive.

*/ 19 FETCH cv BULK COLLECT INTO aa_objects; 20 21 /* 22 * Not passing the ref cursor to a client 23 * in this example so close it... Until 9i, we could only BULK COLLECT columns of scalar types or single instances of object types (i.e. In keeping with 9i's extended support for record-based operations, we can now BULK COLLECT a collection of records stored in a table into either an associative array or collection variable.

In the following example we are going to denormalise the way we store information on our tables and columns.

Result of all the 3 queries is same: SELECT DATENAME(year, getdate()) AS 'This is year' SELECT DATENAME(yyyy, getdate()) AS 'This is year' SELECT DATENAME(yy, getdate()) AS 'This is year' Result: This is year 2017 DATENAME Example 6 Below query finds current timezone.

Now, Oracle is one of the most sophisticated database management systems.

PL/SQL allows to simplify application development and improve performance.