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Update Commonly Used SQL Functions.md

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Original file line number	Diff line number	Diff line change
`@@ -9,19 +9,27 @@ SELECT COUNT(*) FROM employees`
`9`	`9`	```sql
`10`	`10`	`-- Count the number of employees in each department`
`11`	`11`	`SELECT department, COUNT(*) FROM employees GROUP BY department;`
`12`		`-`
	`12`	+```
`13`	`13`	`## 2. SUM()`
`14`	`14`	`Calculates the sum of a set of values.`
`15`	`15`	`Returns the total sum of a numeric column.`
`16`	`16`	```sql
`17`	`17`	`SELECT SUM(salary) FROM employees`
`18`	`18`	```
	`19`	+```sql
	`20`	`+-- Calculate the total sum of salaries in each department`
	`21`	`+SELECT department, SUM(salary) FROM employees GROUP BY department;`
	`22`	+```
`19`	`23`	`## 3. AVG()`
`20`	`24`	`Calculates the average value of a set of values.`
`21`	`25`	`Returns the average value of a numeric column.`
`22`	`26`	```sql
`23`	`27`	`SELECT AVG(salary) FROM employees`
`24`	`28`	```
	`29`	+```sql
	`30`	`+-- Calculate the average salary in each department`
	`31`	`+SELECT department, AVG(salary) FROM employees GROUP BY department;`
	`32`	+```
`25`	`33`	`## 4. MAX()`
`26`	`34`	`Returns the maximum value in a set of values.`
`27`	`35`	`Finds the highest value in a specified column.`

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