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KwickClips Databases and SQL · 40 sec · free

Do you have to recreate a table to add a column?

Short answer. No. Use ALTER TABLE ADD.

Does ALTER delete rows?

No. Existing rows stay.

Remember

ALTER changes structure
Rows stay safe

Your table is ready, but you forgot a column. Start again? No. The one letter table is student. Alter adds a column, changes its type, or drops it. It adds a primary key too. Alter changes the structure. Your existing rows stay safe.

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 secDROP TABLE and DROP DATABASE statements with a warning.Can a DROP be undone?37 sec
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