Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind SQL COLUMN Keyword?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ TABLE Employees3Order
Put the learning moves in the order that makes the concept easiest to apply.
The DROP COLUMN command is used to delete a column in an existing table.
The following SQL changes the data type of the column named "BirthDate" in the "Employees" table to type year:
The ALTER COLUMN command is used to change the data type of a column in a table.
Alter Column
The ALTER COLUMN command is used to change the data type of a column in a table.
The following SQL changes the data type of the column named "BirthDate" in the "Employees" table to type year:
Example
ALTER TABLE Employees
ALTER COLUMN BirthDate
year;Drop Column
The DROP COLUMN command is used to delete a column in an existing table.
The following SQL deletes the "ContactName" column from the "Customers" table:
Example
ALTER TABLE Customers
DROP COLUMN ContactName;