Mixing
how to make group by column value should appear at only first row
In oracle, query is resturning this dataset
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
10 | JOHN | 20000
10 | SCOTT | 20000
20 | BOB | 50000
20 | BETTY | 50000
my objective is to make it as below
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
| JOHN | 20000
| SCOTT | 20000
20 | BOB | 50000
| BETTY | 50000
dep name should appear at once until new dep start.
sql oracle
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
add a comment |
In oracle, query is resturning this dataset
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
10 | JOHN | 20000
10 | SCOTT | 20000
20 | BOB | 50000
20 | BETTY | 50000
my objective is to make it as below
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
| JOHN | 20000
| SCOTT | 20000
20 | BOB | 50000
| BETTY | 50000
dep name should appear at once until new dep start.
sql oracle
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
1
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04
add a comment |
In oracle, query is resturning this dataset
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
10 | JOHN | 20000
10 | SCOTT | 20000
20 | BOB | 50000
20 | BETTY | 50000
my objective is to make it as below
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
| JOHN | 20000
| SCOTT | 20000
20 | BOB | 50000
| BETTY | 50000
dep name should appear at once until new dep start.
sql oracle
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
In oracle, query is resturning this dataset
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
10 | JOHN | 20000
10 | SCOTT | 20000
20 | BOB | 50000
20 | BETTY | 50000
my objective is to make it as below
DEPT | EMP_NAME | SALARY
-----+----------+-------
10 | MARY | 30000
| JOHN | 20000
| SCOTT | 20000
20 | BOB | 50000
| BETTY | 50000
dep name should appear at once until new dep start.
sql oracle
sql oracle
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
edited Nov 21 '18 at 15:47
Thorsten Kettner
51.8k32642
51.8k32642
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
asked Nov 21 '18 at 15:40
Shoaib AhmedShoaib Ahmed
102
102
1
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04
add a comment |
1
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04
1
1
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04
add a comment |
1 Answer
1
active
oldest
votes
Assuming your results are ordered by department, employee name, you could use the LAG function to find the first row for each department. You'd need to check each row to see if it has a different department than the previous row, something like this:
SELECT CASE /* Check if there's a different department number on this row compared to the previous row */
WHEN NVL(LAG(t.dept) OVER (ORDER BY t.dept, t.emp_name),-1) <> t.dept /* If previous row is null (ie, this is the first row), use -1 as previous dept number so comparison does not fail */
THEN t.dept
END AS display_dept,
t.emp_name,
t.salary
FROM myTable t
ORDER BY t.dept, t.emp_name
That said, as others have pointed out, this really isn't something SQL is meant to do; you'd be much better off having this logic be in whatever is displaying the query results than in the query itself.
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
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
Assuming your results are ordered by department, employee name, you could use the LAG function to find the first row for each department. You'd need to check each row to see if it has a different department than the previous row, something like this:
SELECT CASE /* Check if there's a different department number on this row compared to the previous row */
WHEN NVL(LAG(t.dept) OVER (ORDER BY t.dept, t.emp_name),-1) <> t.dept /* If previous row is null (ie, this is the first row), use -1 as previous dept number so comparison does not fail */
THEN t.dept
END AS display_dept,
t.emp_name,
t.salary
FROM myTable t
ORDER BY t.dept, t.emp_name
That said, as others have pointed out, this really isn't something SQL is meant to do; you'd be much better off having this logic be in whatever is displaying the query results than in the query itself.
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
add a comment |
Assuming your results are ordered by department, employee name, you could use the LAG function to find the first row for each department. You'd need to check each row to see if it has a different department than the previous row, something like this:
SELECT CASE /* Check if there's a different department number on this row compared to the previous row */
WHEN NVL(LAG(t.dept) OVER (ORDER BY t.dept, t.emp_name),-1) <> t.dept /* If previous row is null (ie, this is the first row), use -1 as previous dept number so comparison does not fail */
THEN t.dept
END AS display_dept,
t.emp_name,
t.salary
FROM myTable t
ORDER BY t.dept, t.emp_name
That said, as others have pointed out, this really isn't something SQL is meant to do; you'd be much better off having this logic be in whatever is displaying the query results than in the query itself.
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
add a comment |
Assuming your results are ordered by department, employee name, you could use the LAG function to find the first row for each department. You'd need to check each row to see if it has a different department than the previous row, something like this:
SELECT CASE /* Check if there's a different department number on this row compared to the previous row */
WHEN NVL(LAG(t.dept) OVER (ORDER BY t.dept, t.emp_name),-1) <> t.dept /* If previous row is null (ie, this is the first row), use -1 as previous dept number so comparison does not fail */
THEN t.dept
END AS display_dept,
t.emp_name,
t.salary
FROM myTable t
ORDER BY t.dept, t.emp_name
That said, as others have pointed out, this really isn't something SQL is meant to do; you'd be much better off having this logic be in whatever is displaying the query results than in the query itself.
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
Assuming your results are ordered by department, employee name, you could use the LAG function to find the first row for each department. You'd need to check each row to see if it has a different department than the previous row, something like this:
SELECT CASE /* Check if there's a different department number on this row compared to the previous row */
WHEN NVL(LAG(t.dept) OVER (ORDER BY t.dept, t.emp_name),-1) <> t.dept /* If previous row is null (ie, this is the first row), use -1 as previous dept number so comparison does not fail */
THEN t.dept
END AS display_dept,
t.emp_name,
t.salary
FROM myTable t
ORDER BY t.dept, t.emp_name
That said, as others have pointed out, this really isn't something SQL is meant to do; you'd be much better off having this logic be in whatever is displaying the query results than in the query itself.
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
answered Nov 21 '18 at 16:05
Josh EllerJosh Eller
82526
82526
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
add a comment |
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
thanks so much worked for me..!
– Shoaib Ahmed
Nov 21 '18 at 16:58
add a comment |
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1
doing that requires some sort of ordering. What makes "shoaib" the first row? It might not always be the first row returned, unless you've got one or more columns to order by.
– Boneist
Nov 21 '18 at 15:44
This is something you shouldn't do in SQL, but in your GUI layer (app or Website) where you are displaying the data in some grid or table.
– Thorsten Kettner
Nov 21 '18 at 15:53
i have updated my question. see now
– Shoaib Ahmed
Nov 21 '18 at 15:53
I don't see any update.
– Thorsten Kettner
Nov 21 '18 at 16:04