Which of the following conditions will you use in a WHERE clause to select all last names that start with S?
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WHERE LastName = 'S*'
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WHERE LastName = 'S%'
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WHERE LastName LIKE 'S*'
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WHERE LastName LIKE 'S%'
Reveal answer
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D
Correct answer
Explanation
In SQL, the LIKE operator is used for pattern matching. The % wildcard matches any sequence of characters (including zero characters), while * is not a valid wildcard in SQL LIKE clauses. The = operator performs exact matching, not pattern matching.
AI explanation
To select all last names that start with 'S', you would use the LIKE operator in the WHERE clause. The correct condition to use would be:
D. WHERE LastName LIKE 'S%'
Explanation:
- Option A: WHERE LastName = 'S*' - This condition will only select last names that are exactly 'S*'. It will not select any last names that start with 'S'.
- Option B: WHERE LastName = 'S%' - This condition will only select last names that are exactly 'S%' (where '%' is a wildcard that represents any number of characters). It will not select any last names that start with 'S' followed by more characters.
- Option C: WHERE LastName LIKE 'S*' - This condition is similar to Option A and will only select last names that are exactly 'S*'. It will not select any last names that start with 'S'.
- Option D: WHERE LastName LIKE 'S%' - This condition will select last names that start with 'S' followed by any number of characters. The '%' wildcard represents any number of characters, so this condition will select all last names that begin with 'S'.
Therefore, the correct answer is D. WHERE LastName LIKE 'S%'.