DA0-002 · Question #15
A data analyst creates a report, and some of the fields are empty. Which of the following conditions should the analyst add to a query to provide a list of all the records with empty fields?
The correct answer is B. WHERE. To retrieve records where a specific field contains no value, the SQL IS NULL condition is the standard and correct syntax.
Question
A data analyst creates a report, and some of the fields are empty. Which of the following conditions should the analyst add to a query to provide a list of all the records with empty fields?
Options
- AWHERE
- BWHERE
- CWHERE
- DWHERE
How the community answered
(18 responses)- A6% (1)
- B89% (16)
- C6% (1)
Why each option
To retrieve records where a specific field contains no value, the SQL `IS NULL` condition is the standard and correct syntax.
If this represents `WHERE field = ''`, it would only match fields containing an empty string, which is distinct from a true `NULL` value in most database systems.
The `WHERE field IS NULL` condition is used in SQL queries to check for the absence of any data value in a column, which precisely identifies records where a field is considered 'empty' or undefined in a database system.
If this represents `WHERE field = 0`, it would only match fields containing the numeric value zero, which is not equivalent to an empty or null field.
If this represents `WHERE field IS EMPTY`, this is not a standard SQL syntax for checking empty or null values; `IS NULL` is the universally accepted method.
Concept tested: SQL WHERE clause for NULL values
Source: https://learn.microsoft.com/en-us/sql/t-sql/queries/is-null-transact-sql?view=sql-server-ver16
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