How do I optimize this extremely simple MySQL query?
I am using MySQL 5.7 (can't change this), and I am kind of new to MySQL. I have a fair amount of experience with SQL sever so just trying to work through some of these quirks.
The query I want to run is
select *
from temp_main_working t
left outer join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
where s.pm_order_id is null
The explain looks like this
If I change the outer join to an inner join (which obviously won't give me what I want), as such
select *
from temp_main_working t
inner join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
I get an explain that looks like this
which is obviously much better for performance.
In other cases where i use a left join, it managed to use associated indexes just fine. What is going on here? How do I get it to run efficiently?
mysql optimization
asked 1 min ago
Chechy LevasChechy Levas
101
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Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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I am using MySQL 5.7 (can't change this), and I am kind of new to MySQL. I have a fair amount of experience with SQL sever so just trying to work through some of these quirks.
The query I want to run is
select *
from temp_main_working t
left outer join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
where s.pm_order_id is null
The explain looks like this
If I change the outer join to an inner join (which obviously won't give me what I want), as such
select *
from temp_main_working t
inner join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
I get an explain that looks like this
which is obviously much better for performance.
In other cases where i use a left join, it managed to use associated indexes just fine. What is going on here? How do I get it to run efficiently?
mysql optimization
asked 1 min ago
Chechy LevasChechy Levas
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I am using MySQL 5.7 (can't change this), and I am kind of new to MySQL. I have a fair amount of experience with SQL sever so just trying to work through some of these quirks.
The query I want to run is
select *
from temp_main_working t
left outer join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
where s.pm_order_id is null
The explain looks like this
If I change the outer join to an inner join (which obviously won't give me what I want), as such
select *
from temp_main_working t
inner join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
I get an explain that looks like this
which is obviously much better for performance.
In other cases where i use a left join, it managed to use associated indexes just fine. What is going on here? How do I get it to run efficiently?
mysql optimization
asked 1 min ago
Chechy LevasChechy Levas
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am using MySQL 5.7 (can't change this), and I am kind of new to MySQL. I have a fair amount of experience with SQL sever so just trying to work through some of these quirks.
The query I want to run is
select *
from temp_main_working t
left outer join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
where s.pm_order_id is null
The explain looks like this
If I change the outer join to an inner join (which obviously won't give me what I want), as such
select *
from temp_main_working t
inner join temp_sf s on t.PM_ORDER_ID = s.pm_order_id
I get an explain that looks like this
which is obviously much better for performance.
In other cases where i use a left join, it managed to use associated indexes just fine. What is going on here? How do I get it to run efficiently?
mysql optimization
mysql optimization
asked 1 min ago
Chechy LevasChechy Levas
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
Chechy LevasChechy Levas
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
Chechy LevasChechy Levas
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
Chechy LevasChechy Levas
101
asked 1 min ago
Chechy LevasChechy Levas
101
101
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Chechy Levas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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