Insira a coluna com valor padrão no SQL
ALTER TABLE users
ADD visit_number INT DEFAULT 0;
Cerbrain
ALTER TABLE users
ADD visit_number INT DEFAULT 0;ALTER TABLE <table_name> ADD DEFAULT <DEFAULT_VALUE> FOR <NAME_OF_COLUMN>ALTER TABLE {TABLENAME}
ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL}
CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE}
WITH VALUES