Select the value of max(date) and id with mysql
0
I want the last dated record. But my query doesn't work. Where am I doing wrong?
Example data:
|-------------------------------------------------------------------|
| id | messagges | mes_date | send_user | rec_user |
|-------------------------------------------------------------------|
| 1 | hello | 2019-01-18 12:12:12 | 7 | 1 |
| 2 | forget | 2019-01-16 10:10:10 | 8 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 9 | 1 |
| 4 | drink | 2018-12-16 08:08:08 | 10 | 3 |
|-------------------------------------------------------------------|
My query:
SELECT distinct lst.id,lst.messagges,lst.mes_date, lst.rec_user
FROM mes_table lst
join (select mes_date, id from messagges
order by mes_date desc) as msg on lst.id = msg.id
group by lst.rec_user
I need:
|--------------------------------------------------------|
| id | messagges | mes_date | rec_user |
|--------------------------------------------------------|
| 2 | forget | 2019-01-16 10:10:10 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 1 |
|--------------------------------------------------------|
mysql query
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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0
I want the last dated record. But my query doesn't work. Where am I doing wrong?
Example data:
|-------------------------------------------------------------------|
| id | messagges | mes_date | send_user | rec_user |
|-------------------------------------------------------------------|
| 1 | hello | 2019-01-18 12:12:12 | 7 | 1 |
| 2 | forget | 2019-01-16 10:10:10 | 8 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 9 | 1 |
| 4 | drink | 2018-12-16 08:08:08 | 10 | 3 |
|-------------------------------------------------------------------|
My query:
SELECT distinct lst.id,lst.messagges,lst.mes_date, lst.rec_user
FROM mes_table lst
join (select mes_date, id from messagges
order by mes_date desc) as msg on lst.id = msg.id
group by lst.rec_user
I need:
|--------------------------------------------------------|
| id | messagges | mes_date | rec_user |
|--------------------------------------------------------|
| 2 | forget | 2019-01-16 10:10:10 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 1 |
|--------------------------------------------------------|
mysql query
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 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 |
0
0
0
I want the last dated record. But my query doesn't work. Where am I doing wrong?
Example data:
|-------------------------------------------------------------------|
| id | messagges | mes_date | send_user | rec_user |
|-------------------------------------------------------------------|
| 1 | hello | 2019-01-18 12:12:12 | 7 | 1 |
| 2 | forget | 2019-01-16 10:10:10 | 8 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 9 | 1 |
| 4 | drink | 2018-12-16 08:08:08 | 10 | 3 |
|-------------------------------------------------------------------|
My query:
SELECT distinct lst.id,lst.messagges,lst.mes_date, lst.rec_user
FROM mes_table lst
join (select mes_date, id from messagges
order by mes_date desc) as msg on lst.id = msg.id
group by lst.rec_user
I need:
|--------------------------------------------------------|
| id | messagges | mes_date | rec_user |
|--------------------------------------------------------|
| 2 | forget | 2019-01-16 10:10:10 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 1 |
|--------------------------------------------------------|
mysql query
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I want the last dated record. But my query doesn't work. Where am I doing wrong?
Example data:
|-------------------------------------------------------------------|
| id | messagges | mes_date | send_user | rec_user |
|-------------------------------------------------------------------|
| 1 | hello | 2019-01-18 12:12:12 | 7 | 1 |
| 2 | forget | 2019-01-16 10:10:10 | 8 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 9 | 1 |
| 4 | drink | 2018-12-16 08:08:08 | 10 | 3 |
|-------------------------------------------------------------------|
My query:
SELECT distinct lst.id,lst.messagges,lst.mes_date, lst.rec_user
FROM mes_table lst
join (select mes_date, id from messagges
order by mes_date desc) as msg on lst.id = msg.id
group by lst.rec_user
I need:
|--------------------------------------------------------|
| id | messagges | mes_date | rec_user |
|--------------------------------------------------------|
| 2 | forget | 2019-01-16 10:10:10 | 3 |
| 3 | say | 2019-02-20 14:14:14 | 1 |
|--------------------------------------------------------|
mysql query
mysql query
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 12 hours ago
Tota1907Tota1907
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 12 hours ago
Tota1907Tota1907
1
asked 12 hours ago
Tota1907Tota1907
1
1
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Tota1907 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Tota1907 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 |
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1 Answer
1
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votes
0
- Don't mix
DISTINCTandGROUP BY. The do roughly the same thing. - When you want just the last, use
ORDER BY .. DESC LIMIT 1
Simplify to
SELECT lst.id, lst.messagges, lst.mes_date, lst.rec_user
FROM mes_table AS lst
JOIN messagges AS msg ON msg.id = lst.id
ORDER BY msg.mes_date DESC
LIMIT 1
answered 12 hours ago
Rick JamesRick James
41.5k22258
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
- Don't mix
DISTINCTandGROUP BY. The do roughly the same thing. - When you want just the last, use
ORDER BY .. DESC LIMIT 1
Simplify to
SELECT lst.id, lst.messagges, lst.mes_date, lst.rec_user
FROM mes_table AS lst
JOIN messagges AS msg ON msg.id = lst.id
ORDER BY msg.mes_date DESC
LIMIT 1
answered 12 hours ago
Rick JamesRick James
41.5k22258
add a comment |
0
- Don't mix
DISTINCTandGROUP BY. The do roughly the same thing. - When you want just the last, use
ORDER BY .. DESC LIMIT 1
Simplify to
SELECT lst.id, lst.messagges, lst.mes_date, lst.rec_user
FROM mes_table AS lst
JOIN messagges AS msg ON msg.id = lst.id
ORDER BY msg.mes_date DESC
LIMIT 1
answered 12 hours ago
Rick JamesRick James
41.5k22258
add a comment |
0
0
0
- Don't mix
DISTINCTandGROUP BY. The do roughly the same thing. - When you want just the last, use
ORDER BY .. DESC LIMIT 1
Simplify to
SELECT lst.id, lst.messagges, lst.mes_date, lst.rec_user
FROM mes_table AS lst
JOIN messagges AS msg ON msg.id = lst.id
ORDER BY msg.mes_date DESC
LIMIT 1
answered 12 hours ago
Rick JamesRick James
41.5k22258
- Don't mix
DISTINCTandGROUP BY. The do roughly the same thing. - When you want just the last, use
ORDER BY .. DESC LIMIT 1
Simplify to
SELECT lst.id, lst.messagges, lst.mes_date, lst.rec_user
FROM mes_table AS lst
JOIN messagges AS msg ON msg.id = lst.id
ORDER BY msg.mes_date DESC
LIMIT 1
answered 12 hours ago
Rick JamesRick James
41.5k22258
answered 12 hours ago
Rick JamesRick James
41.5k22258
answered 12 hours ago
Rick JamesRick James
41.5k22258
answered 12 hours ago
Rick JamesRick James
41.5k22258
41.5k22258
add a comment |
add a comment |
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