Update Readme.md

Author: cbpspratap

Chapter 7/Readme.md

@@ -443,16 +443,53 @@ FROM purchase;
 
 
 
+### Mathematical Functions
 
+[Click here](https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html) to get the list of all MySQL mathematical functions.
 
+| Name| Description |
+|-----------|-------------|
+| ABS()| Return the absolute value |
+| TRUNCATE()| Truncate to specified number of decimal places |
+| CEIL()| Returns the smallest integer value that is greater than or equal to the number. |
+| CEILING()| Returns the smallest integer value that is greater than or equal to the number. |
+| FLOOR()| Returns the largest integer value that is equal to or less than the number. |
+| POW()| Return the argument raised to the specified power |
+| POWER()| Return the argument raised to the specified power |
+| SQRT()| Return the square root of the argument |
+| MOD()| Return the remainder |
+| PI()| Return the value of pi |
+| DEGREES()| Convert radians to degrees |
+| RADIANS()| Return argument converted to radians |
+| EXP()| Returns e raised to the power of number (or enumber). |
+| SIN()| Return the sine of the argument |
+| COS()| Return the cosine |
+| TAN()| Return the tangent of the argument |
+| LOG10()| Return the base-10 logarithm of the argument |
+| RAND()| Return a random floating-point value |
 
 
+<br>
 
 
+#### ABS Function
 
+The ABS() function returns the absolute (positive) value of a number.
 
+**Syntax**
 
+```sql
+ABS(number)
+```
 
+**Example:** Below example returns the absolute value 273.15
+
+```sql
+SELECT ABS(−273.15);
+```
+
+
+<br>
 
 
 
@@ -470,31 +507,8 @@ FROM purchase;
 
 
 
-### Mathematical Functions
 
-[Click here](https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html) to get the list of all MySQL mathematical functions.
 
-| Name| Description |
-|-----------|-------------|
-| ABS()| Return the absolute value |
-| TRUNCATE()| Truncate to specified number of decimal places |
-| CEIL()| Returns the smallest integer value that is greater than or equal to the number. |
-| CEILING()| Returns the smallest integer value that is greater than or equal to the number. |
-| FLOOR()| Returns the largest integer value that is equal to or less than the number. |
-| POW()| Return the argument raised to the specified power |
-| POWER()| Return the argument raised to the specified power |
-| SQRT()| Return the square root of the argument |
-| MOD()| Return the remainder |
-| PI()| Return the value of pi |
-| DEGREES()| Convert radians to degrees |
-| RADIANS()| Return argument converted to radians |
-| EXP()| Returns e raised to the power of number (or enumber). |
-| SIN()| Return the sine of the argument |
-| COS()| Return the cosine |
-| TAN()| Return the tangent of the argument |
-| LOG10()| Return the base-10 logarithm of the argument |
-| RAND()| Return a random floating-point value |
 
 
-<br>