PostgreSQL 10: Deleting Orphan Rows in Table A on only IDs existing in Table B?
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PostgreSQL 10: Deleting Orphan Rows in Table A on only IDs existing in Table B?
How do I delete orphan rows in Table A:
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | f | d | 2 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
On only IDs existing in Table B (only check IDs a & c, leave d alone):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
Result(the second row a,f,d,2 was removed):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
My thinking is that I should group by ID on Table B to a temp table then loop delete on non matching rows on Table A
Because I'm new to PostgreSQL, can you show me how this can be done? Also, if there's a better way, please let me know as well. Thanks in advance!
postgresql postgresql-10
asked 22 secs ago
sojim2sojim2
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How do I delete orphan rows in Table A:
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | f | d | 2 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
On only IDs existing in Table B (only check IDs a & c, leave d alone):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
Result(the second row a,f,d,2 was removed):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
My thinking is that I should group by ID on Table B to a temp table then loop delete on non matching rows on Table A
Because I'm new to PostgreSQL, can you show me how this can be done? Also, if there's a better way, please let me know as well. Thanks in advance!
postgresql postgresql-10
asked 22 secs ago
sojim2sojim2
101
New contributor
sojim2 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 |
How do I delete orphan rows in Table A:
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | f | d | 2 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
On only IDs existing in Table B (only check IDs a & c, leave d alone):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
Result(the second row a,f,d,2 was removed):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
My thinking is that I should group by ID on Table B to a temp table then loop delete on non matching rows on Table A
Because I'm new to PostgreSQL, can you show me how this can be done? Also, if there's a better way, please let me know as well. Thanks in advance!
postgresql postgresql-10
asked 22 secs ago
sojim2sojim2
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
How do I delete orphan rows in Table A:
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | f | d | 2 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
On only IDs existing in Table B (only check IDs a & c, leave d alone):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
Result(the second row a,f,d,2 was removed):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
My thinking is that I should group by ID on Table B to a temp table then loop delete on non matching rows on Table A
Because I'm new to PostgreSQL, can you show me how this can be done? Also, if there's a better way, please let me know as well. Thanks in advance!
postgresql postgresql-10
postgresql postgresql-10
asked 22 secs ago
sojim2sojim2
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 22 secs ago
sojim2sojim2
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 22 secs ago
sojim2sojim2
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 22 secs ago
sojim2sojim2
101
asked 22 secs ago
sojim2sojim2
101
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
sojim2 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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