Question

I have two tables (employee & log_sheet) and I want to insert the date of today into log_sheet when there is no record found in log_sheet for the user. If there is a record, it should return some value.

SELECT employee.id,
       employee.name,
       log_sheet.`date`
FROM   employee
       LEFT OUTER JOIN log_sheet
                    ON employee.id = log_sheet.employee_id
WHERE  employee.name = 'admin' 

Answer 1

So you want to make sure that every employee has at least one log_sheet, right?

Something like this should work:

INSERT INTO log_sheet (employee_id, date)
    SELECT id, DATE(NOW()) 
    FROM   employee
    WHERE  name = 'admin' 
      AND  id NOT IN ( SELECT DISTINCT employee_id FROM log_sheet ) 

To preview what this would do, add # before the INSERT line.