Query Execution order in oracle | Clause execution sequence in oracle | Oracle
This video lesson helps to understand the query execution order in oracle.
The query in oracle executed in following order.
1. FROM / JOIN : When you write any query, SQL starts by identifying the tables for the data retrieval and how they are connected.
2. WHERE: It acts as a filter; it filters the record based on the conditions specified by the users.
3. GROUP BY: The filtered data is grouped based on the specified condition.
4. HAVING: It is similar to the WHERE clause but applied after grouping the data.
5. SELECT: The clause selects the columns to be included in the final result.
6. DISTINCT: Remove the duplicate rows from the result. Once you apply this clause, you are only left with distinct records.
7. ORDER BY: It sorts (increasing/decreasing/A to Z/Z to A) the results based on the specified condition.
8. LIMIT / OFFSET: It determines the number of records to return and from where to start.
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