Read: Top 9 Data Science Tools in You can use the IsDate function in SQL to check whether the passed value follows the specified format or not. It returns 1 true or 0 false accordingly. Running this query will return 0 since the passed value does not match the specified format. You can get the year from a date in an SQL server by running the following query:. You must use the MOD function to fetch the even and odd records from a table.
For even records, the query will be:. EmpID, E. EmpFname, E. Department AND E. With that, we come to the end of our SQL query interview questions list. The more you practice, the better you will get at writing SQL queries to access and manipulate data in a data table. Data Science. The users cannot see the indexes, they are just used to speed up queries. Effective indexes are one of the best ways to improve performance in a database.
Fetch employee names and salary even if the salary value is not present for the employee. Write an SQL query to fetch all the Employees who are also managers. Here, we can use Self-Join as the requirement wants us to analyze the StudentDetails table as two different tables, each for Student and enrollment records. In the mentioned below query first, we fetch the project-wise count and then sort the result by count.
SQL queries to find the nth highest stipend form the table for various Databases are as described below. We can also use LEFT which returns the left part of a string till specified number of characters. We have to use of correlated subquery for finding the 3rd highest stipend the inner query will return us the count of till we find that there are two rows that stipend higher than other distinct stipends. This is all about SQL Query interview questions with complete answers.
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