What is the execution order of Oracle statements?

In Oracle, the typical execution order of SQL statements is as follows:

  1. Firstly, identify the data table to be queried and perform any necessary join operations.
  2. WHERE clause: filters the data retrieved from the FROM clause based on specified conditions, only data that meets the conditions will be queried.
  3. GROUP BY clause: groups the data that meets the WHERE condition.
  4. HAVING clause: filter the grouped data in the GROUP BY clause based on specified conditions.
  5. SELECT clause: specifies the fields to be retrieved in a query.
  6. ORDER BY clause: sorts the results of a query.

In practice, the Oracle database system will sequentially execute the SQL statements according to the above order, generating the final query result.

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