Write a query find number of employees whose DOB is between to and are grouped according to gender SELECT CONCAT(EmpFname, ' ', EmpLname) AS 'FullName' FROM EmployeeInfo The first name and the last name must be separated with space.
Write a query to retrieve the EmpFname and EmpLname in a single column as “FullName”. SELECT * FROM EmpPosition ORDER BY Salary DESC LIMIT N SELECT MID(Address, 0, LOCATE('(',Address)) FROM EmployeeInfo Write a query to fetch only the place name(string before brackets) from the Address column of EmployeeInfo table. SELECT SUBSTRING(EmpLname, 1, 4) FROM EmployeeInfo
Write a query to retrieve the first four characters of EmpLname from the EmployeeInfo table. You can write a query as follows in MySQL: You can write a query as follows in SQL Server: SELECT COUNT(*) FROM EmployeeInfo WHERE Department = 'HR' Write a query to fetch the number of employees working in the department ‘HR’. SELECT UPPER(EmpFname) AS EmpName FROM EmployeeInfo Write a query to fetch the EmpFname from the EmployeeInfo table in upper case and use the ALIAS name as EmpName. Write a query to retrieve the EmpFname and EmpLname in a single column as “FullName”.Write a query to find the names of employees that begin with ‘S’.Write q query to find all the employees whose salary is between 50000 to 100000.Write a query to create a new table that consists of data and structure copied from the other table.Write a query to fetch only the place name(string before brackets) from the Address column of EmployeeInfo table.Write a query to retrieve the first four characters of EmpLname from the EmployeeInfo table.Write a query to fetch the number of employees working in the department ‘HR’.Write a query to fetch the EmpFname from the EmployeeInfo table in the upper case and use the ALIAS name as EmpName.Let us start by taking a look at some of the most frequently asked SQL Query interview questions, In this article on SQL Query Interview Questions, I will discuss a few queries which you must practice to become a Database Administrator and will also help you ace your interviews.įor, your better understanding, I will be considering the following tables to write queries. With the humongous amount of data present, it is very important for us to understand how to use queries to retrieve the required data. And, although relational databases are not suited for unstructured data analysis, MySQL can integrate with Hadoop distributed file systems (HDFS) for big data insights with the use of packages like Apache Sqoop and Hive, Hadoop Applier, and Cloudera Impala.SQL or Structured Query Language is a standard language for dealing with relational databases. MySQL can import and export data to and from spreadsheets as well as other databases enabling data collection, analysis, and presentation across various platforms. MySQL is important to learn because it performs quickly with large datasets, supports collaboration, and can prepare data to be used with other analysis tools. While Excel holds the data as well as the formulas and output of analysis in the same file, MySQL creates a relational database that multiple users can interact with simultaneously through structured query language (SQL) queries, allowing for data analysis workflows that are fast, secure, and scalable. The advantage of using relational database software like MySQL over a spreadsheet program like Microsoft Excel is in the separation of the data from the program itself. MySQL is a relational database management system (DBMS) that can import, export, and edit structured data in tables for exploratory data analysis.