KwickClips Databases and SQL · 39 sec · free
Which operator means not equal?
Short answer. <> or !=.
Why was the NULL row not shown?
NULL fails every comparison.
Remember
| = equal, <> not equal |
| > < >= <= compare sizes |
| NULL fails every compare |
Kabir is in the table. Why did where skip him? Where keeps rows where the condition is true. Kabir's marks are NULL, so the check fails. One equals compares. Less greater means not equal. NULL fails every comparison.
This clip is from the full lesson: SQL SELECT: Choosing Rows and Columns with WHERE — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 11 Informatics Practices (065), CBSE Class 11 Informatics Practices (065)
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