Database Redesign
What SQL command can be used to delete columns from a table?

MODIFY TABLE TableName DROP ColumnName
MODIFY TABLE TableName DROP COLUMN ColumnName
ALTER TABLE TableName DROP ColumnName
ALTER TABLE TableName DROP COLUMN ColumnName

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Database Redesign
The EXISTS keyword will be true if:

both of these two conditions are met.
all rows in the subquery fail the condition only.
neither of these two conditions is met.
any row in the subquery meets the condition only.

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