If count >= row then insert row
I do 99% php/javascript work so getting my head around SQL is always a struggle, sorry if I seem dense.
So I've got a table that looks something like this:
post_id | meta_key | meta_value
--------------------------------------
1 | requirement | 3
2 | requirement | 1
3 | requirement | 1
1 | adder_id | 3
1 | adder_id | 2
1 | adder_id | 69
2 | adder_id | 42
2 | complete_date| 20190309040445
On an insert trigger I want to run a query that will for each post_id that dose not have a "complete date":
INSERT INTO this_table ( post_id, meta_key, meta_value )
VALUES
( var_post_id, 'complete_date',NOW());
But only if
SELECT COUNT(*)
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'adder_id'
is >=
SELECT meta_value
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'requirement'
So post_id two is the intended effect (requires 1, has 1, got a complete date) while post_id one is an example of something that should trigger an update (requires 3, has 3, waiting on a complete date) and post_id three should be ignored (requires 1, has 0, just ignore).
Now this would be easy enough with an if/else and 2 or three variables but is this even possible with a mySQL statement? Is there an easier way of going about it within mySQL or should I try and find a PHP solution instead?
Thanks for any assistance, I don't usually ask for help here unless I'm properly stumped and this one really has me going.
mysql trigger count
asked 10 mins ago
Robert PorterRobert Porter
1
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add a comment |
I do 99% php/javascript work so getting my head around SQL is always a struggle, sorry if I seem dense.
So I've got a table that looks something like this:
post_id | meta_key | meta_value
--------------------------------------
1 | requirement | 3
2 | requirement | 1
3 | requirement | 1
1 | adder_id | 3
1 | adder_id | 2
1 | adder_id | 69
2 | adder_id | 42
2 | complete_date| 20190309040445
On an insert trigger I want to run a query that will for each post_id that dose not have a "complete date":
INSERT INTO this_table ( post_id, meta_key, meta_value )
VALUES
( var_post_id, 'complete_date',NOW());
But only if
SELECT COUNT(*)
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'adder_id'
is >=
SELECT meta_value
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'requirement'
So post_id two is the intended effect (requires 1, has 1, got a complete date) while post_id one is an example of something that should trigger an update (requires 3, has 3, waiting on a complete date) and post_id three should be ignored (requires 1, has 0, just ignore).
Now this would be easy enough with an if/else and 2 or three variables but is this even possible with a mySQL statement? Is there an easier way of going about it within mySQL or should I try and find a PHP solution instead?
Thanks for any assistance, I don't usually ask for help here unless I'm properly stumped and this one really has me going.
mysql trigger count
asked 10 mins ago
Robert PorterRobert Porter
1
New contributor
Robert Porter 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 do 99% php/javascript work so getting my head around SQL is always a struggle, sorry if I seem dense.
So I've got a table that looks something like this:
post_id | meta_key | meta_value
--------------------------------------
1 | requirement | 3
2 | requirement | 1
3 | requirement | 1
1 | adder_id | 3
1 | adder_id | 2
1 | adder_id | 69
2 | adder_id | 42
2 | complete_date| 20190309040445
On an insert trigger I want to run a query that will for each post_id that dose not have a "complete date":
INSERT INTO this_table ( post_id, meta_key, meta_value )
VALUES
( var_post_id, 'complete_date',NOW());
But only if
SELECT COUNT(*)
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'adder_id'
is >=
SELECT meta_value
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'requirement'
So post_id two is the intended effect (requires 1, has 1, got a complete date) while post_id one is an example of something that should trigger an update (requires 3, has 3, waiting on a complete date) and post_id three should be ignored (requires 1, has 0, just ignore).
Now this would be easy enough with an if/else and 2 or three variables but is this even possible with a mySQL statement? Is there an easier way of going about it within mySQL or should I try and find a PHP solution instead?
Thanks for any assistance, I don't usually ask for help here unless I'm properly stumped and this one really has me going.
mysql trigger count
asked 10 mins ago
Robert PorterRobert Porter
1
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I do 99% php/javascript work so getting my head around SQL is always a struggle, sorry if I seem dense.
So I've got a table that looks something like this:
post_id | meta_key | meta_value
--------------------------------------
1 | requirement | 3
2 | requirement | 1
3 | requirement | 1
1 | adder_id | 3
1 | adder_id | 2
1 | adder_id | 69
2 | adder_id | 42
2 | complete_date| 20190309040445
On an insert trigger I want to run a query that will for each post_id that dose not have a "complete date":
INSERT INTO this_table ( post_id, meta_key, meta_value )
VALUES
( var_post_id, 'complete_date',NOW());
But only if
SELECT COUNT(*)
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'adder_id'
is >=
SELECT meta_value
FROM this_table
WHERE post_id = var_post_id
AND meta_key = 'requirement'
So post_id two is the intended effect (requires 1, has 1, got a complete date) while post_id one is an example of something that should trigger an update (requires 3, has 3, waiting on a complete date) and post_id three should be ignored (requires 1, has 0, just ignore).
Now this would be easy enough with an if/else and 2 or three variables but is this even possible with a mySQL statement? Is there an easier way of going about it within mySQL or should I try and find a PHP solution instead?
Thanks for any assistance, I don't usually ask for help here unless I'm properly stumped and this one really has me going.
mysql trigger count
mysql trigger count
asked 10 mins ago
Robert PorterRobert Porter
1
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 10 mins ago
Robert PorterRobert Porter
1
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 10 mins ago
Robert PorterRobert Porter
1
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 10 mins ago
Robert PorterRobert Porter
1
asked 10 mins ago
Robert PorterRobert Porter
1
1
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Robert Porter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Robert Porter 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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