Single-Row Subquery:Queries that return only one row from the inner select statement. Single-row comparison operators are: =, >, >=, <, <=, <> Multiple-Row Subquery:Queries that return more than one row from the inner Select statement. There are also multiple-column subqueries that return...
15. What are UNION, MINUS, and INTERSECT in SQL? UNION: Union operation combines results from two queries, and removes duplicates. MINUS: Minus operation returns rows from the first query that are not in the second query. INTERSECT: Intersect returns rows that are common to both queries. 16...
Operators are the special keywords or special characters reserved for performing particular operations. They are also used in SQL queries. We can primarily use these operators within the WHERE clause of SQL commands. It's a part of the command to filters data based on the specified condition. T...
Once you connect to the master database, run the diagnostic queries to find the problem Correct the issue and restart the server9. Which are the third-party tools used in SQL Server and why would you use them? Some of the third-party tools used in SQL Server are:SQL...
Eventually, in an outer query, apply aWHEREfilter and aCOUNT()function on the result of the subquery. Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salariesFROM employeesJOIN salariesON employees.employee_id = salaries.employee_idGROUP BY dep...
In SQL interviews, success comes from a combination of mastering core concepts, consistent practice, and a calm, structured approach to solving problems. By understanding key SQL operations, optimizing your queries, and being prepared to tackle complex scenarios, you’ll be able to impress interview...
11. Joe Celkos 的 SQL 谜题 The SQL queries are an integral part of programming job interviews, and this book has some of the best SQL query challenges you will ever see. Once you have gone through the puzzles given in this book, you should be comfortable dealing with any kind of SQL ...
As a note, all the queries listed in the examples below are written in Microsoft SQL Server.Common SQL Interview Questions What are the set operators in SQL? What is cross join in SQL? How to fetch alternate records from the table. What is the difference between the RANK() and DENSE_...
These two queries are joined on the column hacker_id using JOIN. After that, the output is filtered to show only the total scores above zero. Finally, the result is sorted by total score descendingly and by the hacker ID ascendingly. ...
29) How to create a Stored Procedure in MySQL? A stored procedure is a group of SQL statements that we save in the database. The SQL queries, including INSERT, UPDATE, DELETE, etc. can be a part of the stored procedure. A procedure allows us to use the same code over and over agai...