MYSQL Join From Two Tables

Question

I am not sure what I am missing but I know it should not be this hard. I have two tables. First table lists all the possible jobs for a site. The second table has when a job was completed at a site. I want a query where by I get all the possible jobs and join in the data from the seconds table should there be some. Site that have not completed the job would have a NULL value.

Example:

Table 1:
ID
name
decsription

Table 2:
ID
siteID
status
jobID

SELECT table1.* , table2.*
FROM table1
LEFT JOIN table2
ON table1.id = table2.jobID
WHERE siteID = 12

This only returns jobs that have been completed and not all jobs completed and uncompleted.

Thanks in advance for your help.

Answer 1

如果需要此特定站点，则应删除where语句（当第二个表中的行为emty时，它不满足siteID = 12的条件）或进行更改（添加“ OR siteID is NULL”）。

Answer 2

A simple change should do, just change the order of the values on the JOIN , like this:

SELECT table1.* , table2.* 
FROM table1
LEFT JOIN table2
ON table2.jobID = table1.id
WHERE siteID = 12 OR siteID IS NULL

And keep in mind the siteID will be NULL when there are no results, so change your WHERE as well.