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SQL Exercises: Find the number of customers who gets at least a gradation for his/her performance

SQL Aggregate Functions: Exercise-5 with Solution

From the following table, write a SQL query to determine the number of customers who received at least one grade for their activity.

Sample table: customer


Sample Solution:

SELECT COUNT (ALL grade) 
FROM customer;

Output of the Query:

count
7

Explanation:

Syntax of find the number of customers who gets at least a gradation for his/her performance

Pictorial presentation:

Find the number of customers who gets at least a gradation for his/her performance

Practice Online


Query Visualization:

Duration:

Query visualization of Find the number of customers who gets at least a gradation for his/her performance - Duration

Rows:

Query visualization of Find the number of customers who gets at least a gradation for his/her performance - Rows

Cost:

Query visualization of Find the number of customers who gets at least a gradation for his/her performance - Cost

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Previous: From the following table, write a SQL query to count the number of customers. Return number of customers.
Next: From the following table, write a SQL query to find the maximum purchase amount.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3