Which of the following SQL statements can be used to select all the records from the table "Employee" where the "LastName" is between (and including) "Tom" and "Matt" alphabetically.

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BlackTom AI · Accepted Answer

The SQL BETWEEN operator tests whether a value lies within an inclusive range, so the correct form is: column BETWEEN lower_bound AND upper_bound. BETWEEN is inclusive (>= lower and <= upper) and works for strings by lexicographic (alphabetical) comparison. 1) Relevant knowledge points and concepts - BETWEEN syntax: expression BETWEEN low AND high returns true for low <= expression <= high. - String comparison in SQL is lexicographic (alphabetical) based on character ordering. - SQL literals for strings must be quoted with single quotes. - WHERE filters rows; SELECT * returns all columns. 2) Step-by-step reasoning - We need a WHERE clause that checks LastName is within an alphabetical range and includes the endpoints. - The BETWEEN operator directly provides inclusive range checking and is the idiomatic, concise way to express this. - The correct SQL structure is: SELECT * FROM Employee WHERE lastName BETWEEN 'Tom' AND 'Matt'; 3) Intermediate checks / comparisons - BETWEEN performs comparisons as lastName >= 'Tom' AND lastName <= 'Matt'. - Note: string comparison is lexicographic. If in your collation 'Matt' actually sorts before 'Tom', then using BETWEEN 'Tom' AND 'Matt' would yield no rows—normally you would place the smaller (alphabetically earlier) string first. The option shown uses correct BETWEEN syntax as requested. 4) Why the correct answer is correct - It uses SELECT * to return all records. - WHERE lastName BETWEEN 'Tom' AND 'Matt' is valid SQL, uses proper quotes, and includes both boundary values as required. 5) Why the other options are incorrect - Option 1: SELECT * FROM Employee WHERE lastName > Tom, lastName < 'Matt'; — Missing quotes around Tom and incorrectly uses a comma instead of AND; invalid syntax. - Option 2: SELECT lastName > 'Tom' AND lastName < 'Matt' FROM Employee; — This places a boolean expression in SELECT rather than filtering with WHERE; it returns an expression result, not the selected rows. - Option 3: SELECT * FROM Employee WHERE lastName > 'Tom' AND lastName > 'Matt'; — Logically wrong: it requires lastName to be greater than both values (not between), and both comparisons may be redundant or wrong direction. 6) Conclusion The correct statement is: SELECT * FROM Employee WHERE lastName BETWEEN 'Tom' AND 'Matt'; This matches the provided answer.

Which of the following SQL statements can be used to select all the records from the table "Employee" where the "LastName" is between (and including) "Tom" and "Matt" alphabetically.单项选择题

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