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(only the second row a,f,d,2 was deleted):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
This is just an example, real tables contain many more IDs and variations.
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 per ID.
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 3 mins 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(only the second row a,f,d,2 was deleted):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
This is just an example, real tables contain many more IDs and variations.
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 per ID.
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 3 mins 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(only the second row a,f,d,2 was deleted):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
This is just an example, real tables contain many more IDs and variations.
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 per ID.
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 3 mins 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(only the second row a,f,d,2 was deleted):
+---------+--------+----------+-------+
| ID | option | category | rates |
+---------+--------+----------+-------+
| a | f | null | 2.5 |
+---------+--------+----------+-------+
| a | g | e | 3 |
+---------+--------+----------+-------+
| c | g | e | 4 |
+---------+--------+----------+-------+
| d | f | d | 1 |
+---------+--------+----------+-------+
This is just an example, real tables contain many more IDs and variations.
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 per ID.
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 3 mins 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 3 mins 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 3 mins ago
sojim2sojim2
101
New contributor
sojim2 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked 3 mins ago
sojim2sojim2
101
asked 3 mins 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.
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