SQL expression examples

The first six examples in this section all refer to a grid that contains three columns from the employee table: emp_id, dept_id, and salary.

The expression <50000 in the Criteria row in the salary column in the grid retrieves information for employees whose salaries are less than $50,000.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE employee.salary < '50000'

The expression 100 in the Criteria row in the DeptId column in the grid retrieves information for employees who belong to department 100.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE employee.dept_id ='100'

The expression >300 in the Criteria row in the EmpId column and the expression <50000 in the Criteria row in the Salary column in the grid retrieve information for any employee whose employee ID is greater than 300 and whose salary is less than $50,000.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE (employee.emp_id >'300') AND
   employee.salary <'50000'

The expressions 100 in the Criteria row and >300 in the Or row for the DeptId column, together with the expression <50000 in the Criteria row in the Salary column, retrieve information for employees who belong to:

• Department 100 and have a salary less than $50,000

  or

• A department whose ID is greater than 300, no matter what their salaries

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE (employee.dept_id = '100') AND 
   (emplyee.salary < '50000')OR 
   (employee.dept_id > '300')

The expression IN(100,200) in the Criteria row in the DeptId column in the grid retrieves information for employees who are in department 100 or 200.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE employee.dept_id IN ('100,200')

This example shows the use of the word AND in the Or criteria row. In the Criteria row, >=500 is in the EmpId column and >=30000 is in the Salary column. In the Or row, AND <=1000 is in the EmpId column and AND <=50000 is in the Salary column. These criteria retrieve information for employees who have an employee ID from 500 to 1000 and a salary from $30,000 to $50,000.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_id, 
   employee.dept_id, 
   employee.salary
FROM employee
WHERE (((employee.emp_id >='500') AND
   (employee.salary >='30000') AND
   (employee.emp_id <='1000') AND
   (employee.salary <='50000')))

In a grid with three columns: emp_last_name, emp_first_name, and salary, the expressions LIKE C% in the Criteria row and LIKE G% in the Or row in the emp_last_name column retrieve information for employees who have last names that begin with C or G.

The SELECT statement that PowerBuilder creates is:

SELECT employee.emp_last_name, 
   employee.emp_first_name, 
   employee.salary
FROM employee
WHERE (((employee.emp_last_name LIKE 'C%'))OR
   ((employee.emp_last_name LIKE 'G%')))

You can allow your users to specify selection criteria in a DataWindow object using these techniques at runtime: