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KwickClips Databases and SQL · 37 sec · free

Can a DROP be undone?

Short answer. No. DDL saves at once.

What should you do before a DROP?

Take a backup.

Remember

DROP has no undo
Back up before you DROP

Which S Q L command can wipe a whole school in one second? Drop table deletes the table and its rows. Drop database deletes every table. No undo. Drop has no undo. Always back up first.

This clip is from the full lesson: SQL Data Definition: CREATE DATABASE, CREATE TABLE, ALTER and DROP — 6 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: CBSE Class 10 Information Technology (402), CBSE Class 10 Information Technology (402), CBSE Class 12 Computer Science (083), CBSE Class 11 Informatics Practices (065)

More KwickClips from this lesson

SQL code: CREATE DATABASE school, then USE school, then SHOW TABLES.Why the error 'No database selected'?39 secCREATE TABLE code with four constraints marked.How do you stop two students sharing a roll number?43 secALTER TABLE statements adding, modifying and dropping a column.Do you have to recreate a table to add a column?40 sec
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