Query to find the second highest column value in a table
In this ms sql server tutorial you will learn query to find the second highest column value in a table.
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One of the most common SQL interview questions is to find the Nth highest salary of employee, where N could be 2, 3, 4 or anything e.g. find the second highest salary in SQL. Sometimes this question is also twisted as to find the nth minimum salary in SQL. Since many Programmers only know the easy way to solve this problem e.g. by using SQL IN clause, which doesn't scale well, they struggle to write the SQL query when Interviewer keep asking about 4th highest, 5th highest and so on.
Write a SQL query to get the second highest salary from the Employee table. For example, given the above Employee table, the second highest salary is 200. If there is no second highest salary, then the query should return NULL. You can write SQL query in any of your favorite database e.g. MySQL, Microsoft SQL Server or Oracle.
In this ms sql server tutorial you will learn query to find the second lowest column value in a table.
In this tutorial, you will learn how to select the Nth highest record in a database table by using various techniques. These techniques are very useful, for instance you may want to see the product which is second most expensive in Products database table.
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If you have used SQL a bit, you are certainly familiar with so-called set functions or aggregate functions COUNT, SUM, AVG, described in the manual. For example, let’s say that I am the owner of a shop and I keep track of daily sales in this table: create table sales (month int, day int, amount int); The first column is the number of the month, between 1 and 12, the second column is the number of the day in the month, between 1 and 31, and the third column is how much we sold on that date.
Once you have your table data organized, the next step is to figure out the data type. There are three main types : text, numbers, and Dates/Times. Choosing the column types specifies what information can or can't be stored in a table cell. Using the most correct option for each column is important as it may affect the database's overall performance.
A cross tabulation query, or cross tab/crosstab for short, is used to display the result of an aggregation on two or more fields. The trick to this type of query is the transformation of rows of data to columns. That presents the data in a table format in which one field is displayed down the left side of a matrix (row headings) and the other across the top (column headings).