Skip to content

docs: Update explanation for NOT NULL constraint on qty column #4078

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
chibx wants to merge 2 commits into
base: main
Choose a base branch
from
Open

docs: Update explanation for NOT NULL constraint on qty column #4078

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
bc1231f
Update explanation for NOT NULL constraint on qty column
chibx Oct 25, 2025
75fa016
Fix grammatical errors in PostgreSQL array tutorial
chibx Nov 4, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion content/postgresql/postgresql-tutorial/postgresql-array.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ nextLink:

## Introduction to PostgreSQL array data type

In PostgreSQL, an array of a collection of elements that have the same data type.
In PostgreSQL, an array is a collection of elements that have the same data type.

Arrays can be one\-dimensional, multidimensional, or even nested arrays.

Expand Down
2 changes: 1 addition & 1 deletion content/postgresql/postgresql-tutorial/postgresql-not-null-constraint.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,7 @@ INSERT INTO production_orders (description)
VALUES('Make for Infosys inc.');
```

Then, to make sure that the `qty` field is not null, you can add the not\-null constraint to the `qty` column. However, the column already contains data. If you try to add the not\-null constraint, PostgreSQL will issue an error.
Then, to make sure that the `qty` field is not null, you can add the not\-null constraint to the `qty` column. However, the column currently contains no value \(NULL\). If you try to add the not\-null constraint, PostgreSQL will issue an error.

To add the `NOT NULL` constraint to a column that already contains NULL, you need to update `NULL` to non\-NULL first, like this:

Expand Down