Which of the following search conditions can be used to identify records that do not have data stored in a column named ColB?
A) ColB = NULL
B) ColB IS NOT NULL
C) ColB IS NULL
D) ColB = ' '

Question

Which of the following search conditions can be used to identify records that do not have data stored in a column named ColB?​
A) ​ColB = NULL
B) ​ColB IS NOT NULL
C) ​ColB IS NULL
D) ​ColB = ' '

Quizplus · Accepted Answer

The condition "ColB IS NULL" checks for records where the value in ColB is NULL, which means there is no data stored in that column. Option A, "ColB = NULL," will not return any records because the comparison of NULL to anything is always false. Option B, "ColB IS NOT NULL," will return records where there is data stored in ColB, which is the opposite of what we want. Option D, "ColB = ' '," checks for records where there is a space character stored in ColB, which may or may not be equivalent to having no data stored in the column. Therefore, option C is the best choice for identifying records that do not have data stored in ColB.

Which of the Following Search Conditions Can Be Used to Identify