We can also use the SQL-99 “WITH clause” instead of temporary tables. The Oracle SQL “WITH clause” will compute the aggregation once, give it a name, and allow us to reference it (maybe multiple times), later in the query. The SQL-99 “WITH clause” is very confusing at first b...
WITH subquery_name AS (the aggregation SQL statement) SELECT (query naming subquery_name); Retuning to our oversimplified example, let's replace the temporary tables with the SQL "WITH clause" (Note: You may find a faster execution plan by using Global Temporary tables, depending on your rele...
Example - With Single condition It is difficult to explain the syntax for the Oracle WHERE clause, so let's look at some examples. SELECT * FROM customers WHERE last_name = 'Anderson'; In this Oracle WHERE clause example, we've used the WHERE clause to filter our results from the ...
To see how the “WITHclause” is used in ANSI SQL-99 syntax, here is an excerpt from Jonathan Gennick’s great work “Understanding theWITHClause” showing the use of the SQL-99 “WITHclause” to traverse a recursive bill-of-materials hierarchy The SQL-99 “WITHclause” is very confusing...
In this example: Theunpivot_clauseisquantitywhich is a column that represents the unpivoted values from theproduct_a,product_b, andproduct_ccolumns. Theunpivot_for_clauseisFOR product_code, which is the column that will hold the measure’s values. ...
WITH subquery_name AS (the aggregation SQL statement) SELECT (query naming subquery_name); Retuning to our oversimplified example, let’s replace the temporary tables with the SQL “WITH clause”: WITH sum_sales AS select sum(quantity) all_sales from stores ...
Example: Creating Joins with the ON clause in Oracle In this example, the employee_id column in the emplolyees table and department_id in departments table are joined using the ON clause. Wherever a employee_id in the EMPLOYEES table equals a department ID in the DEPARTMENTS table, the row...
6. UNION Operator with ORDER BY Clause Query: SELECT empno, ename, deptno FROM Emp WHERE deptno = 10 ORDER BY empno UNION SELECT empno, ename, deptno FROM Emp WHERE deptno = 30 ; Output: In this example output throwing an ERROR even if the column number and data type criteria is matchi...
This Oracle tutorial explains how to use the Oracle WHEN OTHERS clause with syntax and examples. The WHEN OTHERS clause is used to trap all remaining exceptions that have not been handled by your Named System Exceptions and Named Programmer-Defined Excep
Oracle Natural Join with WHERE clause. SQL > SELECT Name, Designation, Salary, State, Deptnumber FROM Employee NATURAL JOIN Dept_Category WHERE Deptnumber =10; Output: In the above example, WHERE clause condition filters the result and returns only those records which are having Deptnumber is ...