Learn SQL Programming from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

Top 10 SQL Concepts for Job Interview

Kavaiya Yashumar Amrutlal
30/11/2021 0 0

1. SELECT and FROM: This is the “heart” of any SQL query - SELECT columns FROM table.

2. WHERE: This acts as a filter and allows you to select only relevant rows based on conditions.

3. GROUP BY: This helps you aggregate the data by grouping columns.

4. AVG/SUM/MAX/MIN: These are aggregate functions that help you summarise the data.

5. COUNT and DISTINCT: Count helps you find the number of entries and Distinct helps you find unique entries.

6. CASE WHEN: This is a very useful way to create a new derived field or perform complex aggregate operations.

7. JOIN: Join helps you combine data from different tables using join conditions. Please get familiar with inner and left/right/full outer joins.

8. UNION: Union and Union All help you to combine data from multiple tables with similar structure.

9. WINDOW FUNCTION: Allow you to perform calculations across a set of rows.

10. CTE and SUBQUERY: They help you create more complex queries by combining smaller queries.

0 Dislike
Follow 1

Please Enter a comment


Other Lessons for You

Structured query language-It is a language to interact with the database. Database-It is a collection of data's in the form of tables. Tables-Collection of rows and columns Rows are also called as tuples...

Rana Vikram Singh | 10/01/2020

1 0

How does a SQL Query Execute inside Oracle? What are the steps followed in the background?
The above snapshot says it all. Hence it is said, 'Picture says it all'. Basically, there are 4-5 steps. There are two possible ways of query being executed. 1. Soft Parse- Improves performance....

Gavi Y. | 05/01/2020

0 0

Interview questions based on "level", a pseudocolumn
1. Write a query to get the below output, 1 11 21 31 .. .. 91 2 12 22 32 .. .. 92 3 13 23 33 .. .. 93 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 10 20 30 40 ...

Gavi Y. | 05/01/2020

0 0

Troubleshooting SQL Server Agent failed Jobs - Common daily routine work for DBA
If you are lazy and not intended to do repetitive manual work at a routine time, then SQL Server Agent job help you achieve this. SQL Server agent jobs help to automate the execution of the recurring task...

Meetopus | 06/08/2018

1 0

Why Windows Administration knowledge is required for SQL DBA.
As the RDBMS system runs on the windows server operating system and for most of its function is depended on windows OS. Hence SQL DBA should know the basic windows to review various services, events and...

Meetopus | 06/08/2018

0 0

Looking for SQL Programming Classes?

The best tutors for SQL Programming Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn SQL Programming with the Best Tutors

The best Tutors for SQL Programming Classes are on UrbanPro

Book a Free Demo

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more