Write an SQL query to retrieve the supplier number and supplier names from the supplier table, where the supplier name starts with the letter ‘R’.
The correct answer and explanation is :
Here’s an SQL query to retrieve the supplier number and supplier names from the supplier table where the supplier name starts with the letter “R”:
Explanation:
- SELECT supplier_number, supplier_name: This part of the query is specifying the columns that we want to retrieve from the database. We want the supplier_number and the supplier_name to be included in the results.
- FROM supplier: This part indicates the table from which the data should be retrieved. In this case, the supplier table is being used.
- WHERE supplier_name LIKE ‘R%’: This is the condition that filters the records based on the supplier name. The WHERE clause is used to restrict the rows returned by the query.
- The LIKE operator is used to search for a specified pattern in a column.
- The pattern
'R%'means the query will find all supplier names that start with the letter ‘R’. - The
%symbol is a wildcard character that matches any number of characters (including zero). So, this condition will match any supplier whose name starts with ‘R’, followed by any combination of characters (or no characters at all).
How the Query Works:
- The SELECT statement specifies which columns you want to retrieve (in this case, supplier_number and supplier_name).
- The FROM supplier part tells the database which table to pull the data from.
- The WHERE clause is the filter that ensures only those rows where the supplier_name starts with “R” are included in the results.
By using LIKE ‘R%’, it ensures that only the supplier names beginning with the letter “R” are selected, and all the suppliers that match this condition are displayed along with their respective numbers.
Visual Representation:
Here’s the visual representation of the SQL query showing how it retrieves the supplier number and supplier names from the supplier table where the supplier name starts with the letter “R.”