sql add column with value code example

Example 1: sql add column

ALTER TABLE Customers
ADD Email varchar(255);

Example 2: add column table sql default value

ALTER TABLE users
ADD visit_number INT DEFAULT 0;

Example 3: how to add column to table sql

ALTER TABLE table_name ADD column_name varchar(50);

Example 4: sql how to add a column

ALTER TABLE table_name

ADD column_name datatype;

Example 5: Add a new column into table

ALTER TABLE table ADD [COLUMN] column_name;

Example 6: Insert and initialize a SQL column with value dependent on another column data

UPDATE table
SET col = new_value
WHERE col = old_value
AND other_col = some_other_value;

UPDATE table
SET col = new_value
WHERE col = old_value
OR other_col = some_other_value;