# Print all the prime numbers between ‘m’ and ‘n’ in PL/SQL

Prerequisite – PL/SQL Introduction

In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements. In declare part, we declare variables and between begin and end part, we perform the operations.

Problem :
Write a script in PL/SQL to display all the prime numbers between any two positive whole numbers.

Explanation :
Here, all the prime numbers between any two numbers taken as input as the upper limit and the lower limit are returned.A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.

In this implementation, the number of divisors of a number that occurs between the two limits is counted which should be 2 (1 and the number itself). If the number of divisors is 2, then that number is returned.

For example, consider the number 5. It has only two divisors: 1 and the number 5 itself.
Hence, it is a prime number.

Examples :

```Input: 10  20
Output: 11 13 17 19

Input: 20  30
Output: 23 29  ```

Below is the implementation :

 `  `  `DECLARE ` `--the upper limit and the lower limit are taken as user inputs. ` `   ``low number(2); ` `   ``high number(2); ` `   ``n number(2); ` `   ``m number(2); ` `   ``c number(20); ` `BEGIN ` `   ``dbms_output.put_line('Enter the lower and higher limit:'); ` `   ``low:=&low; ` `   ``high:=&high; ` `--The main operation happens in this loop ` `  ``for n IN low.. high  ` `    ``loop ` `       ``c:=0; ` `       ``for m IN 1.. n ` `         ``loop   ` `           ``if mod(n, m)=0 then ` `             ``c:=c+1; ` `            ``end if; ` `            ``end loop; ` `--the number of divisors for each number in the range is counted and then checked. ` `            ``if c<=2 then  ` `               ``dbms_output.put_line(n||'\n'); ` `            ``end if; ` `         ``end loop; ` `          `  `END; `

Output :

```Input:
Enter the lower and higher limit:1  10
Output: 2
3
5
7 ```

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