---
title: "Top Mainframe Interview Questions (1 of 3)"
description: "The complex mainframe questions that are asked recently in an interview given here for your ready reference."
url: https://srinimf.com/2015/03/12/top-mainframe-interview-questions/
date: 2015-03-12
modified: 2025-04-26
author: "Srini"
image: https://i0.wp.com/srinimf.com/wp-content/uploads/2015/03/pexels-photo-5668869.jpeg?fit=1880%2C1253&ssl=1
categories: ["Categories", "Mainframe Interview Questions"]
tags: ["Interview Questions"]
type: post
lang: en
---

# Top Mainframe Interview Questions (1 of 3)

The subsequent primary interview questions related to COBOL, JCL, and DB2 for mainframe positions.

## **COBOL interview questions**

**Q1). How to write ‘SRINI’ as ‘INIRS’?**

A1) Use function “REVERSE”

**Q2). What is String and Unstring in COBOL?**

A2). String – To concatenate multiple data fields into a single string

Unstring- To split main string, to get only particular string

**JCL Questions:**

**Q1). How to override DD name of proc?**

```
//step1 exec proc
//procstep.data1  dd  dsn=xyz
//*
```

**Q2). Difference between Steplib, Jcllib, JOBlib?**

Steplib- It applies for only that particular step

Joblib – It applies to whole job

JCLlib- It has proc libraries, include members etc

//jcllib order=test.proclib

**Q3). What is Cond=(4,LT) at step?**

It validates previous step return code. If true, step will be bypassed. If false, step will be executed.

**DB2 SQL Questions:**

**Q1) Write Cursor flow?**

- Declare cursor
- Open cursor
- Fetch cursor
- Close Cursor

**Q2) Write a query to get max salary?**

Select max(salary) from emp_table

**Q3) Write a query to get nth highest salary?**

```
Select distinct salary from emp1 e1  where
n = (select count(distinct salary) from emp1 e2 where
e1.salary <= e2.salary)
```

**SQL QUIZ ANSWERS**

1. A, C; 2. D; 3. E; 4.B; 5. A, D

[SQL QUIZ LInks](http://srinimf.com/2015/07/02/db2-sql-quiz-for-mainframe-programmers/)

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