Need to display records by joining two tables ( left outer join) .the records should be unique

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I have two tables student and TaskEffort. Many students must have worked on same task. For particular task the name of the students and effort should be considered.
The student table contains students info and TaskEffort table contains taskid, studentid, Effort

I need to display the taskid,first name,last name,effort. For those who worked on particular task.

Query I tried is

SQL

SELECT t.id, s.firstname,s.lastname, t.effort 
FROM taskeffort t 
LEFT OUTER JOIN student s ON t.id = 4 AND s.studentid = t.studentid

I need output only for task I'd 4 but I am getting for all task id .

Can someone help me out

Posted 16-Sep-15 2:31am

Member 10279468

Updated 16-Sep-15 3:05am

RelicV

v2

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RelicV · Accepted Answer · 2015-09-16T03:09:00

Solution 1

Hello,

Your join is causing issues.

SQL

SELECT t.id, s.firstname,s.lastname, t.effort
FROM taskeffort t
LEFT OUTER JOIN student s ON s.studentid = t.studentid
WHERE t.id = 4

If you want to get only task id = 4 records, it should be added in WHERE clause.

RelicV

Posted 16-Sep-15 3:09am

RelicV

Updated 16-Sep-15 3:10am

v2