Completed concept entry for Postgresql operators #4764

content/postgresql/concepts/operators/operators.md

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+---
+Title: 'Operators'
+Description: 'Enable users to perform different operations on the data.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Data'
+  - 'Database'
+  - 'Operators'
+  - 'PostgreSQL'
+CatalogContent:
+  - 'learn-sql'
+  - 'paths/analyze-data-with-sql'
+---
+
+In PostgreSQL, **operators** enable users to perform different operations on the data in one or multiple tables in a [database](https://www.codecademy.com/resources/docs/general/database). They can be used for calculations, comparisons, joining, filtering, etc.
+
+## Syntax
+
+There are many operators that can be used in PostgreSQL. Here are some common ones:
+
+### Comparison Operators
+
+The following operators can be categorized as comparison operators:
+
+```pseudo
+// Equal to
+SELECT * FROM table_name
+WHERE column1 = 'North';
+
+// Not Equal to
+SELECT * FROM table_name
+WHERE column1 != column2;
+
+// Greater than
+SELECT * FROM table_name
+WHERE column1 > 10;
+
+// Less than
+SELECT * FROM table_name
+WHERE column1 < 1000;
+```
+
+### Logical Operators
+
+The following operators can be categorized as logical operators:
+
+```pseudo
+// AND
+SELECT * FROM table_name
+WHERE column1 >= 10 AND column1 <= 1000;
+
+// OR
+SELECT * FROM table_name
+WHERE column1 = 'NORTH' OR 'WEST';
+
+// NOT
+SELECT * FROM table_name
+WHERE NOT column1 = 'SOUTH';
+```
+
+## Examples
+
+The following examples demonstrate the usage of operators in PostgreSQL.
+
+Here's a table named `animals` to be used for the examples:
+
+| `id` | `name` | `species` | `gender` | `age` |
+| ---- | ------ | --------- | -------- | ----- |
+| 01   | Niko   | monkey    | female   | 3     |
+| 02   | Frank  | giraffe   | male     | 4     |
+| 03   | Lyn    | lion      | female   | 6     |
+| 04   | Tom    | elephant  | male     | 7     |
+
+Here's a query that invokes some of the operators mentioned above:
+
+```sql
+SELECT * FROM animals WHERE gender = 'female' AND age >= 4;
+```
+
+The above query results in the following output:
+
+| `id` | `name` | `species` | `gender` | `age` |
+| ---- | ------ | --------- | -------- | ----- |
+| 03   | Lyn    | lion      | female   | 6     |
+
+Here's another query that invokes some operators:
+
+```sql
+SELECT * FROM animals WHERE NOT species = 'lion';
+```
+
+The above query produces the following output:
+
+| `id` | `name` | `species` | `gender` | `age` |
+| ---- | ------ | --------- | -------- | ----- |
+| 01   | Niko   | monkey    | female   | 3     |
+| 02   | Frank  | giraffe   | male     | 4     |
+| 04   | Tom    | elephant  | male     | 7     |