Data Definition Language, or DDL, which lets the candidate carry out different functions and perform tasks on the Database, is one of the most important subsets of SQL. These operations and functions include ALTER, CREATE and DELETE. Data Manipulating Language, or DML, lets the candidates manipu...
172 SQL Questions and Answers:SQL Job Interview Questions Table of Contents: What is SQL (Structured Query Language)? What is the SQL*Plus? What is NVL? What is a Character Functions? What is SET? What is a TTITLE & BTITLE? What is sql BREAK? What is sql JOIN? What is sql ...
These three questions are good examples of what you can expect from the job interview. As you’ve seen, the SQL aggregate functions don’t come alone. They are usually assessed simultaneously with other SQL concepts, such as grouping and filtering data, joining tables, and writing subqueries. ...
Altering a Table 34. What are the NVL and the NVL2 Functions? How do They Differ? NVL(exp1, exp2)andNVL2(exp1, exp2, exp3)are functions that help us with null-checking problems. But there are some differences. As you can see the NVL function accepts 2 parameters, while the NVL2 f...
- Answer: Aggregate functions perform a calculation on a set of values and return a single value. Examples include COUNT, SUM, AVG (average), MIN (minimum), and MAX (maximum). Difference between DELETE and TRUNCATE? - Answer: DELETE removes rows one at a time and logs each delete, ...
What are the NVL and the NVL2 functions in SQL? How do they differ? View answer Both the NVL(exp1, exp2) and NVL2(exp1, exp2, exp3) functions check the value exp1 to see if it is null. With the NVL(exp1, exp2) function, if exp1 is not null, then the value of exp1 is...
(Mostly asked in Interview Questions For SQL) Answer: We have used listagg function and nth val function in our project which has following explaination: Analytical Functions-NTH,LISTAGG: Oracle 11 G specifies two new aggregate functions: 1.LISTAGG: LISTAGG aggregates a column values in a single...
原文出处:https://sqlpad.io/tutorial/4-essential-sql-window-functions-and-examples-for-a-data-scientist-interview-in-2021 作者:Leon 译者:ACDU翻译组(@姚雷) 校对:ACDU翻译组(@帽子菌 @Finn) 介绍 在数据科学家岗位的面试中,窗口函数(WINDOW function)是SQL函数家族中经常会被问到的主题。用窗口函数写一...
18. You have any idea about IIF, SWITCH and LOOKUP functions in SSRS? 19. How to get “Total” values at the end of every group in a report? 20. A SSIS package failed how to know the exact row number at which the package failed to process?
Prepare with basic and advanced PL/SQL interview questions and answers, covering topics like functions, triggers, dynamic SQL, and error handling.