Technology & Computing

How do I calculate percentage in SQL?

By: Jeff Cutler-stammUpdated: February 20, 2021


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    October 01, 2022
  1. The most efficient (using over()). select Grade, count(*) * 100.0 / sum(count(*)) over() from MyTable group by Grade.
  2. Universal (any SQL version). select Grade, count(*) * 100.0 / (select count(*) from MyTable) from MyTable group by Grade;
  3. With CTE, the least efficient.

In this regard, how do you take a percentage?

1. How to calculate percentage of a number. Use the percentage formula: P% * X = Y
  1. Convert the problem to an equation using the percentage formula: P% * X = Y.
  2. P is 10%, X is 150, so the equation is 10% * 150 = Y.
  3. Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10.

Also Know, do calculations in SQL?

Calculating Fields in SQL Functions. You can use the string expression argument in an SQL aggregate function to perform a calculation on values in a field. For example, you could calculate a percentage (such as a surcharge or sales tax) by multiplying a field value by a fraction.

What is the wildcard character in a SQL query?

To broaden the selections of a structured query language (SQL-SELECT) statement, two wildcard characters, the percent sign (%) and the underscore (_), can be used. The percent sign is analogous to the asterisk (*) wildcard character used with MS-DOS.

How do you calculate percent discount in SQL query?

To calculate the final price of an item after multiple discounts, just do something like this: Final Price = (Orig Price)(1 - d1)(1 - d2)(1 - d3) etc etc where d1, d2 are discount percentages as decimals (eg, 0.15 for 15%).


Where is SQL?

The SQL WHERE clause is used to specify a condition while fetching the data from a single table or by joining with multiple tables. If the given condition is satisfied, then only it returns a specific value from the table. You should use the WHERE clause to filter the records and fetching only the necessary records.

How do you calculate percentages in SQL w3schools?

SQL Percent To Total
The subquery SELECT SUM(Sales) FROM Total_Sales calculates the sum. We can then divide the individual values by this sum to obtain the percent to total for each row.

How do I figure out a percentage of two numbers?

If you want to know what percent A is of B, you simple divide A by B, then take that number and move the decimal place two spaces to the right. That's your percentage! To use the calculator, enter two numbers to calculate the percentage the first is of the second by clicking Calculate Percentage.

How do I calculate percentage on calculator?

If your calculator has a percentage button, the calculation is as follows: 40 x 25% = 10. If your calculator does not have a percentage button, you must first divide the percentage by 100: 25 ÷ 100 = 0.25. You can then multiply this answer by the whole to determine the part: 0.25 x 40 = 10.

How do I calculate a percentage between two numbers?

Percentage Change | Increase and Decrease
  1. First: work out the difference (increase) between the two numbers you are comparing.
  2. Increase = New Number - Original Number.
  3. Then: divide the increase by the original number and multiply the answer by 100.
  4. % increase = Increase ÷ Original Number × 100.

How can I calculate average?

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

How do I sum a column in SQL?

The SUM() function returns the total sum of a numeric column.
  1. COUNT() Syntax. SELECT COUNT(column_name) FROM table_name. WHERE condition;
  2. AVG() Syntax. SELECT AVG(column_name) FROM table_name. WHERE condition;
  3. SUM() Syntax. SELECT SUM(column_name) FROM table_name. WHERE condition;

Can a database do calculations?

Field calculations can be performed in a database by adding a formula field. Field calculations allow you to perform addition, subtraction, multiplication, and division operations on any numeric fields in your database. Operations can also be grouped using parentheses (ie.

How do you calculate database?

Create a calculated field in table datasheet view
  1. Open the table by double-clicking it in the Navigation Pane.
  2. Scroll horizontally to the rightmost column in the table, and click the Click to Add column heading.
  3. In the list that appears, click Calculated Field, and then click the data type that you want for the result.

How do I do a Sumif in SQL?

Excels SUMIF in SQL
The the group by and over clauses specify the rows. The column is explicitly used in the <condition> that is put into the case expression. The case expression accepts different values in the when and then branches. This allows you to do the same thing as the third argument of the sumif function.

Can you divide in SQL?

The SQL divide ( / ) operator is used to divide one expressions or numbers by another.


The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

How do you join in SQL?

A SQL JOIN combines records from two tables. A JOIN locates related column values in the two tables.

The SQL JOIN syntax
  1. SELECT column-names.
  2. FROM table-name1 JOIN table-name2.
  3. ON column-name1 = column-name2.
  4. WHERE condition.

How do you calculate GST in SQL?

GST Calculation Formula (India) using SQL Server
  1. Hi, friends GST is now start in INDIA.
  2. The basic calculation is Amount Excluding GST = (100*MRP (With GST))/ (100+GST (%))
  3. For Example MRP Rate = 105 (N.B. MRP is include with GST)
  4. That price has included GST 5%.
  5. Amount Excluding GST = (100 * 105) / (100 + 5)
  6. That will give Amount Excluding GST = 100 Rs.

What are the SQL functions?

SQL has many built-in functions for performing calculations on data.

SQL Functions
  • AVG() - Returns the average value.
  • COUNT() - Returns the number of rows.
  • FIRST() - Returns the first value.
  • LAST() - Returns the last value.
  • MAX() - Returns the largest value.
  • MIN() - Returns the smallest value.
  • SUM() - Returns the sum.

What is SQL logical operator?

Logical Operators. The Logical operators are those that are true or false. They return a true or false values to combine one or more true or false values. Logical OR compares between two Booleans as expression and returns true when one of the expression is true