What is the output of the following SQL statement: `SELECT INSTR(last_name, 'g') FROM employees WHERE first_name = 'Steven';` given an employee's `first_name` is 'Steven' and `last... What is the output of the following SQL statement: `SELECT INSTR(last_name, 'g') FROM employees WHERE first_name = 'Steven';` given an employee's `first_name` is 'Steven' and `last_name` is 'King'?
Understand the Problem
The question asks to predict the output of an SQL query. The query uses the INSTR function to find the position of the substring 'g' within the last_name column for the employee whose first_name is 'Steven'. We need to determine the position of 'g' in 'King'. The index starts at 1, so the first character is at index 1. If the substring is not found, the function returns 0.
Answer
0
The output of the SQL statement SELECT INSTR(last_name, 'g') FROM employees WHERE first_name = 'Steven'; given that the first_name is 'Steven' and last_name is 'King' is 0.
Answer for screen readers
The output of the SQL statement SELECT INSTR(last_name, 'g') FROM employees WHERE first_name = 'Steven'; given that the first_name is 'Steven' and last_name is 'King' is 0.
More Information
The INSTR() function in SQL returns the starting position of the first occurrence of a substring within a string. If the substring is not found, the function returns 0. In this case, the query searches for the substring 'g' within the last_name 'King'. Since 'g' is not present in 'King', the function returns 0.
Tips
A common mistake is to assume that INSTR() returns a boolean value (true/false) instead of the index, or to not realize it returns 0 when the substring isn't found.
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