MySQL - 3 Table Join? (my brain hurts)
MySQL problem:
Alright, here's the deal...
I've got two tables (tblComp, and tblTools)
tblComp
comp_id <- key
comp_name
comp_app
tblTools
tool_id <- key
tool_name
tool_desc
tool_details
tblComp houses details about specific components
tbltools houses details about specific tools
one component can have multiple tools
one tool can be used by multiple components
a tool will never exist without component
a component may exist without a tool
As is my understanding, 'relations' in MySQL are handled through the use of one JOIN or another.
Short of adding tool_id1, tool_id2, tool_id3... to the tblComp table, I don't see how this can be done with only two tables (or I'm donig something wrong).
I've built a 3rd (lookup) table called tblCompTool
tblCompTool
reference_id <- key
comp_id
tool_id
Maybe I'm just having a brain fart, but every join I've tried has failed to return the desired results (thus this message).
If you can provide any help with this, it'd be greatly appreciated.
Thanks.
Alright, here's the deal...
I've got two tables (tblComp, and tblTools)
tblComp
comp_id <- key
comp_name
comp_app
tblTools
tool_id <- key
tool_name
tool_desc
tool_details
tblComp houses details about specific components
tbltools houses details about specific tools
one component can have multiple tools
one tool can be used by multiple components
a tool will never exist without component
a component may exist without a tool
As is my understanding, 'relations' in MySQL are handled through the use of one JOIN or another.
Short of adding tool_id1, tool_id2, tool_id3... to the tblComp table, I don't see how this can be done with only two tables (or I'm donig something wrong).
I've built a 3rd (lookup) table called tblCompTool
tblCompTool
reference_id <- key
comp_id
tool_id
Maybe I'm just having a brain fart, but every join I've tried has failed to return the desired results (thus this message).
If you can provide any help with this, it'd be greatly appreciated.
Thanks.
0
Comments
select * from tblcomptool
inner join tblcomp
on tblcomp.comp_id = tblcomptool.comp_id
inner join tbltools
on tbltools.tool_id = tblcomptool.tool_id