Question

I have two table – report and bouydata

report
------
id  sun
1   overcast

bouydata
----------
reportid  bouy   winddir
1         46026  340
1         46027  345

I want to select all 3 rows into one row. Here’s my query:

  SELECT report.id, sun, bouy1.bouy as bouy1, bouy1.winddir as winddir1, bouy2.bouy as bouy2, bouy2.winddir as winddir2
    FROM report 
    LEFT JOIN bouydata bouy1 
    ON report.id = bouy1.reportid 
    LEFT JOIN bouydata bouy2 
    ON report.id = bouy2.reportid

For some reason I’m getting four rows back:

1   Slightly Overcast   46026   340 46026   340
1   Slightly Overcast   46026   340 46027   345
1   Slightly Overcast   46027   345 46026   340
1   Slightly Overcast   46027   345 46027   345

It’s not selecting only the unique rows and combining them into one row. Can anyone help me get my desired result of:

1   Slightly Overcast   46026   340 46027   345

Answer 1

I don’t know why you’re doing a double-join, with the same tables and same conditions. That just duplicates information.

SELECT report.id, sun, bouy, winddir
FROM report 
LEFT JOIN bouydata
ON report.id = bouydata.reportid 

would give you:

report.id   sun       bouy   winddir
1           overcast  46026  340
1           overcast  46027  345