ou need to run a query that will count all of the records in the products table. The products table lists the productID, productName, and productDescription. The productID field is the primary key. There are no other constraints on any of the fields. What query or queries should you execute? (Choose all that apply.)1 pointSELECT count() * FROM productsSELECT count(DISTINCT productName) FROM productsSELECT count(productID) FROM productsSELECT count(*) FROM productsCoursera Honor Code Learn more
Question
ou need to run a query that will count all of the records in the products table. The products table lists the productID, productName, and productDescription. The productID field is the primary key. There are no other constraints on any of the fields. What query or queries should you execute? (Choose all that apply.)1 pointSELECT count() * FROM productsSELECT count(DISTINCT productName) FROM productsSELECT count(productID) FROM productsSELECT count(*) FROM productsCoursera Honor Code Learn more
Solution
The correct query to count all of the records in the products table would be:
SELECT count(*) FROM products
This query will return the total number of rows in the products table. The count(*) function counts all rows, regardless of whether they contain null values or not.
The other queries will not return the total number of records in the table.
- SELECT count() * FROM products is not a valid SQL syntax.
- SELECT count(DISTINCT productName) FROM products will only count the number of unique product names, not all records.
- SELECT count(productID) FROM products will count the number of productID values, but if there are null values in the productID column, those records will not be counted. Since productID is the primary key, there should not be any null values, but it's generally safer to use count(*) to count all records.
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