Create comments.md under postgresql

content/postgresql/concepts/comments/comments.md

@@ -0,0 +1,54 @@
+---
+Title: 'Comments'
+Description: 'Comments in PostgreSQL are explanatory lines that are ignored by the compiler. They are used to describe the functionality of SQL statements, or to temporarily disable a piece of SQL code. Adding comments to your SQL scripts is considered a best practice, as it makes your code easier to understand and maintain.'
+Subjects:
+  - 'Web Development'
+  - 'Computer Science'
+Tags:
+  - 'Comments'
+  - 'Documentation'
+CatalogContent:
+  - 'getting-started-off-platform-for-data-science'
+  - 'paths/design-databases-with-postgresql'
+  - 'paths/computer-science'
+---
+
+**Comments** are text placed inside code that is not executed. They are intended as documentation or explanation of the code they are a part of.
+
+## Syntax
+
+In PostgreSQL, you can use either single-line or multi-line comments.
+
+- Single-line comments start with `--` and end at the end of the line.
+
+```sql
+-- This is a single-line comment
+```
+
+- Multi-line comments start with `/*` and end with `*/`.
+
+```sql
+/*
+This is a
+multi-line comment
+*/
+```
+
+## Example
+
+Here's an example of how you can use comments in PostgreSQL:
+
+```sql
+-- This is a single-line comment
+SELECT *
+FROM employees; -- This comment is at the end of the line
+
+/*
+This is a multi-line comment
+that spans multiple lines
+*/
+SELECT *
+FROM departments;
+```
+
+In the above example, comments are used to describe what the following SQL statement does. The PostgreSQL compiler will ignore these comments when executing the SQL code.