The following is an example shows a SQL statement with two potential table join paths. “Employee to Department” and “Department to Employee” are...
Here is an example SQL that retrieves data from EMPLOYEE table with “emp_id < 710000” and employee’s department code exists in DEPARTMENT table....
Semi-join is introduced in Oracle 8.0. It provides an efficient method of performing a WHERE EXISTS or WHERE IN sub-queries. A semi-join returns...
The following is an example shows a SQL statement with two union operator in a subquery. The SQL retrieve records from EMPLOYEE table that EMP_ID...
The LIKE is a logical operator that determines if a character string matches a specified pattern. A pattern may include regular characters and...
The following is an example shows a DELETE SQL statement with subquery. The SQL delete records from emp_subsidiary that should satisfy with three...
Here the following is SQL statement with multiple OR subqueries. SELECT * FROM employee WHERE emp_id IN (SELECT emp_id FROM emp_subsidiary where...
The following is an example shows a SQL statement with “Group by” expression. The SQL retrieve the sum of historical salary from table...
Here the following is a simple SQL statement with a CASE expression syntax. SELECT * FROM employee WHERE CASE WHEN emp_salary< 1000 THEN 'low'...
Here the following is a simple SQL statement with a “< ALL (Subquery)” syntax. SELECT * FROM employee a WHERE a.emp_salary <ALL(SELECT...
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