MySQL: Select max from group using the value from a different table?Insert into … values ( SELECT … FROM … )Add a column with a default value to an existing table in SQL ServerRetrieving the last record in each group - MySQLSQL Server: How to Join to first rowHow do I UPDATE from a SELECT in SQL Server?Finding duplicate values in a SQL tableSelect first row in each GROUP BY group?What are the options for storing hierarchical data in a relational database?SQL select only rows with max value on a columnGet records with max value for each group of grouped SQL results
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MySQL: Select max from group using the value from a different table?
Insert into … values ( SELECT … FROM … )Add a column with a default value to an existing table in SQL ServerRetrieving the last record in each group - MySQLSQL Server: How to Join to first rowHow do I UPDATE from a SELECT in SQL Server?Finding duplicate values in a SQL tableSelect first row in each GROUP BY group?What are the options for storing hierarchical data in a relational database?SQL select only rows with max value on a columnGet records with max value for each group of grouped SQL results
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I have two tables, and I'm trying to find the max value of a column in the first table grouped by a column in the second table.
Here's an example of what I mean:
table customers:
customer_id | age
12367 | 23
87693 | 48
66933 | 44
82143 | 38
75454 | 19
38912 | 58
63554 | 80
table purchases:
product_id | customer_id
132 | 12367
132 | 66933
132 | 38912
844 | 12367
844 | 63554
598 | 75454
598 | 87693
598 | 66933
I want to find the customer_id of the oldest purchaser of each product, e.g.:
product_id | customer_id | age
132 | 38912 | 58
844 | 63554 | 80
598 | 87693 | 48
How would I create an mysql query to find this?
mysql sql
asked Mar 24 at 3:51
16jacobj16jacobj
386
add a comment |
I have two tables, and I'm trying to find the max value of a column in the first table grouped by a column in the second table.
Here's an example of what I mean:
table customers:
customer_id | age
12367 | 23
87693 | 48
66933 | 44
82143 | 38
75454 | 19
38912 | 58
63554 | 80
table purchases:
product_id | customer_id
132 | 12367
132 | 66933
132 | 38912
844 | 12367
844 | 63554
598 | 75454
598 | 87693
598 | 66933
I want to find the customer_id of the oldest purchaser of each product, e.g.:
product_id | customer_id | age
132 | 38912 | 58
844 | 63554 | 80
598 | 87693 | 48
How would I create an mysql query to find this?
mysql sql
asked Mar 24 at 3:51
16jacobj16jacobj
386
add a comment |
I have two tables, and I'm trying to find the max value of a column in the first table grouped by a column in the second table.
Here's an example of what I mean:
table customers:
customer_id | age
12367 | 23
87693 | 48
66933 | 44
82143 | 38
75454 | 19
38912 | 58
63554 | 80
table purchases:
product_id | customer_id
132 | 12367
132 | 66933
132 | 38912
844 | 12367
844 | 63554
598 | 75454
598 | 87693
598 | 66933
I want to find the customer_id of the oldest purchaser of each product, e.g.:
product_id | customer_id | age
132 | 38912 | 58
844 | 63554 | 80
598 | 87693 | 48
How would I create an mysql query to find this?
mysql sql
asked Mar 24 at 3:51
16jacobj16jacobj
386
I have two tables, and I'm trying to find the max value of a column in the first table grouped by a column in the second table.
Here's an example of what I mean:
table customers:
customer_id | age
12367 | 23
87693 | 48
66933 | 44
82143 | 38
75454 | 19
38912 | 58
63554 | 80
table purchases:
product_id | customer_id
132 | 12367
132 | 66933
132 | 38912
844 | 12367
844 | 63554
598 | 75454
598 | 87693
598 | 66933
I want to find the customer_id of the oldest purchaser of each product, e.g.:
product_id | customer_id | age
132 | 38912 | 58
844 | 63554 | 80
598 | 87693 | 48
How would I create an mysql query to find this?
mysql sql
mysql sql
asked Mar 24 at 3:51
16jacobj16jacobj
386
asked Mar 24 at 3:51
16jacobj16jacobj
386
asked Mar 24 at 3:51
16jacobj16jacobj
386
asked Mar 24 at 3:51
16jacobj16jacobj
386
asked Mar 24 at 3:51
16jacobj16jacobj
386
386
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
use correlated subquery
select product_id , a.customer_id , age
from purchases a inner join customers b on a.customer_id =b.customer_id
where age in (select max(age) from purchases a1 inner join customers b1 on a1.customer_id =b1.customer_id where a.product_id=a1.product_id group by a1.product_id)
answered Mar 24 at 4:04
fa06fa06
21.5k41019
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
use correlated subquery
select product_id , a.customer_id , age
from purchases a inner join customers b on a.customer_id =b.customer_id
where age in (select max(age) from purchases a1 inner join customers b1 on a1.customer_id =b1.customer_id where a.product_id=a1.product_id group by a1.product_id)
answered Mar 24 at 4:04
fa06fa06
21.5k41019
add a comment |
use correlated subquery
select product_id , a.customer_id , age
from purchases a inner join customers b on a.customer_id =b.customer_id
where age in (select max(age) from purchases a1 inner join customers b1 on a1.customer_id =b1.customer_id where a.product_id=a1.product_id group by a1.product_id)
answered Mar 24 at 4:04
fa06fa06
21.5k41019
add a comment |
use correlated subquery
select product_id , a.customer_id , age
from purchases a inner join customers b on a.customer_id =b.customer_id
where age in (select max(age) from purchases a1 inner join customers b1 on a1.customer_id =b1.customer_id where a.product_id=a1.product_id group by a1.product_id)
answered Mar 24 at 4:04
fa06fa06
21.5k41019
use correlated subquery
select product_id , a.customer_id , age
from purchases a inner join customers b on a.customer_id =b.customer_id
where age in (select max(age) from purchases a1 inner join customers b1 on a1.customer_id =b1.customer_id where a.product_id=a1.product_id group by a1.product_id)
answered Mar 24 at 4:04
fa06fa06
21.5k41019
answered Mar 24 at 4:04
fa06fa06
21.5k41019
answered Mar 24 at 4:04
fa06fa06
21.5k41019
answered Mar 24 at 4:04
fa06fa06
21.5k41019
21.5k41019
add a comment |
add a comment |
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