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Fixed left join syntax: use _on_ not _where_.

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This commit is contained in:
Robert Nickel committed 2022-01-31 18:18:15 +01:00
1 parent 631eb1cc04
commit 5758f229bf
1 file changed
+8 -8
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www/_blog/2020-11-18-postgresql-views.mdx
+8 -8
View File
@@ -62,8 +62,8 @@ create view transcripts as
courses.code,
grades.result
from grades
left join students where grades.student_id = students.id
left join courses where grades.course_id = courses.id;
left join students on grades.student_id = students.id
left join courses on grades.course_id = courses.id;
```
Once done, we can now access the underlying query with:
@@ -95,8 +95,8 @@ select
courses.code,
grades.result
from grades
left join students where grades.student_id = students.id
left join courses where grades.course_id = courses.id;
left join students on grades.student_id = students.id
left join courses on grades.course_id = courses.id;
```
We can run this instead:
@@ -119,8 +119,8 @@ select
courses.code,
grades.result
from grades
left join students where grades.student_id = students.id
left join courses where grades.course_id = courses.id
left join students on grades.student_id = students.id
left join courses on grades.course_id = courses.id
where courses.code != 'PG101';
```
@@ -151,8 +151,8 @@ create materialized view transcripts as
courses.code,
grades.result
from grades
left join students where grades.student_id = students.id
left join courses where grades.course_id = courses.id;
left join students on grades.student_id = students.id
left join courses on grades.course_id = courses.id;
```
Reading from the materialized view is the same as a conventional view: