Most Asked Sql Queries In Interview
Commonly Asked SQL Queries in Interviews
Most Asked Sql Queries In Interview
In SQL interviews, common queries that are frequently asked include SELECT statements with various clauses like WHERE, GROUP BY, HAVING, and ORDER BY for data retrieval and manipulation, JOIN operations to combine data from multiple tables, subqueries to fetch data based on results of another query, aggregate functions like SUM, COUNT, AVG for calculating summary statistics, and CRUD operations (CREATE, READ, UPDATE, DELETE) for data manipulation. Additionally, questions related to data normalization, indexes, keys, and some complex queries involving multiple tables or analytical functions may also be asked to assess the candidate's SQL proficiency.
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1 - SELECT * FROM table_name: This query is commonly asked to retrieve all records from a specific table in a database.
2) SELECT column1, column2 FROM table_name: This query is used to fetch specific columns from a table rather than all columns.
3) SELECT DISTINCT column_name FROM table_name: This query is frequently used to eliminate duplicate values in a specific column.
4) WHERE clause with SELECT statement: Used to filter records based on specific conditions, for example, SELECT * FROM table_name WHERE condition.
5) ORDER BY clause with SELECT statement: This query is used to sort the result set in ascending or descending order based on a specific column.
6) GROUP BY clause with SELECT statement: It's used to group records sharing a common value in a specific column.
7) COUNT() function: This is used to count the number of rows that meet a specified condition.
8) JOIN clause: This is crucial for combining rows from two or more tables based on a related column between them.
9) INNER JOIN: This retrieves records that have matching values in both tables based on the specified column.
10) LEFT JOIN: It retrieves all records from the left table and matching records from the right table.
11) RIGHT JOIN: Similar to the LEFT JOIN, but it retrieves all records from the right table and matching records from the left table.
12) WHERE clause with LIKE operator: This is used to retrieve records based on a pattern in a text field.
13) SUM() function: This function calculates the sum of values in a specified column.
14) MAX() and MIN() functions: These functions retrieve the maximum and minimum values from a specified column in a table.
15) GROUP_CONCAT() function: This function is used to concatenate values from multiple rows into a single string. Mastering these queries will be beneficial in SQL interviews.
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