Updating data using cursor in oracle. Working with Records.



Updating data using cursor in oracle

Updating data using cursor in oracle

Enhanced Merge Functionality In Oracle Database 10g, the MERGE statement has been extended to cover a larger variety of complex and conditional data transformations, allowing faster loading of large volumes of data. You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables. The decision to perform an insert or update is based on conditions specified by you.

The MERGE statement is designed to combine multiple operations to reduce the complexity of mixed insert and update operations. MERGE is what is known as a deterministic statement. When the search condition evaluates to true, Oracle updates the row in the target table with corresponding data from the MERGE source. If no rows satisfy the condition, then Oracle inserts the row into the target table based on the corresponding MERGE source row.

Oracle performs the specified update if the condition of the ON clause is true. As with any normal update, when the update clause is executed, all update triggers defined on the target table are fired. If the condition is false, the update operation is skipped when merging the row into the target table.

The only rows affected by the delete clause of the MERGE statement are those rows in the target table that are updated by the merge operation. If the MERGE statement deletes a row, any delete triggers defined on the target table will be activated for each row deletion. If both are specified, then the order of the clauses is not important. Any column referenced in the ON condition cannot be updated.

As with any normal insert, if the insert clause is executed, all insert triggers defined on the target table are fired. If you wish to insert all of the MERGE source rows into the table, you should use what is known as a "constant filter predicate" in the ON clause.

An example of a constant filter predicate would be: Oracle will skip the insert operation for all rows where the condition evaluates to false.

If both are specified, then they can be in either order. The example creates a bonuses table in the sample schema oe with a default bonus of

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SQL Server Cursor Types - Dynamic Cursors



Updating data using cursor in oracle

Enhanced Merge Functionality In Oracle Database 10g, the MERGE statement has been extended to cover a larger variety of complex and conditional data transformations, allowing faster loading of large volumes of data. You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables. The decision to perform an insert or update is based on conditions specified by you. The MERGE statement is designed to combine multiple operations to reduce the complexity of mixed insert and update operations.

MERGE is what is known as a deterministic statement. When the search condition evaluates to true, Oracle updates the row in the target table with corresponding data from the MERGE source.

If no rows satisfy the condition, then Oracle inserts the row into the target table based on the corresponding MERGE source row. Oracle performs the specified update if the condition of the ON clause is true. As with any normal update, when the update clause is executed, all update triggers defined on the target table are fired.

If the condition is false, the update operation is skipped when merging the row into the target table. The only rows affected by the delete clause of the MERGE statement are those rows in the target table that are updated by the merge operation. If the MERGE statement deletes a row, any delete triggers defined on the target table will be activated for each row deletion. If both are specified, then the order of the clauses is not important.

Any column referenced in the ON condition cannot be updated. As with any normal insert, if the insert clause is executed, all insert triggers defined on the target table are fired. If you wish to insert all of the MERGE source rows into the table, you should use what is known as a "constant filter predicate" in the ON clause.

An example of a constant filter predicate would be: Oracle will skip the insert operation for all rows where the condition evaluates to false.

If both are specified, then they can be in either order. The example creates a bonuses table in the sample schema oe with a default bonus of

Updating data using cursor in oracle

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5 Comments

  1. The F1 Revenue logical fact table contains the measures in your business model. Cursor variables are like pointers to result sets. The statement acts upon the single value or set of values returned by the subquery.

  2. Change the default aggregation rule to Sum. If you only need to loop once through the result set, use a FOR loop as described in the following sections.

  3. You need not close a cursor variable before reopening it. In the Physical layer, expand the alias tables and confirm that all physical columns have not been renamed. Example returns the name and salary of each employee whose salary exceeds the departmental average.

  4. Your time values may differ depending on the hardware resources you are using. F1 Revenue Do not select D4 Address at this time.

  5. Resource plan A container for directives that specify how resources are allocated to resource consumer groups.

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