Microsoft Azure Data FundamentalsDescribe how to work with relational data on AzureEasy
A data analyst is querying an Azure SQL Database that contains sales data. They need to retrieve all orders placed in the 'North' region where the 'OrderTotal' is greater than $500. Which SQL clause should the analyst use to filter the results based on these conditions?
- AFROM
- BSELECT
- CORDER BY
- DWHERE
Show answer & explanationAnswer & explanation
Correct answer: D. WHERE
The WHERE clause in SQL is used to specify filtering conditions for the rows returned by a query. It allows the analyst to select only the rows that meet the criteria of being in the 'North' region and having an 'OrderTotal' greater than $500.
Why the other options are wrong
- A. FROM specifies the table(s) from which to retrieve data, not the filtering conditions.
- B. SELECT specifies the columns to be retrieved, not the rows to be filtered.
- C. ORDER BY sorts the result set based on one or more columns, but it does not filter rows.
SQL WHERE Clause
A SQL clause used to filter the records that are returned by a SELECT statement based on specified conditions.
- Filters rows based on conditions.
- Can include logical operators (AND, OR, NOT).
- Often used with comparison operators (=, <, >, LIKE, IN).
Memory trick: WHERE do I find the data I want? By specifying conditions.