How does Oracle query partitioned data?

1 year ago
William Carter
1 minute

Oracle can query partition data using the following methods:

  1. You can query partitioned data using a standard SELECT statement, for example:
SELECT * FROM table_name PARTITION (partition_name);

In this case, table_name refers to the table to be queried, and partition_name refers to the partition to be queried.

  1. Query partitioned data using the PARTITION BY clause: You can use the PARTITION BY clause to query partitioned data, for example:
SELECT * FROM table_name PARTITION BY (column_name);

table_name represents the name of the table being queried, while column_name is the name of the column used for partitioning.

  1. You can use the DBA_TAB_PARTITIONS data dictionary view to query partition data, for example:
SELECT * FROM DBA_TAB_PARTITIONS WHERE TABLE_NAME = 'table_name' AND PARTITION_NAME = 'partition_name';

table_name is the name of the table to be queried, and partition_name is the name of the partition to be queried.

These methods can be selected based on specific needs to retrieve the desired partition data.

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