maybe_create_table()
Function: Creates a table in the database if it doesn’t already exist.
Source: wp-admin/install-helper.php:54
maybe_add_column()
Function: Adds column to database table, if it doesn’t already exist.
Source: wp-admin/install-helper.php:91
maybe_drop_column()
Function: Drops column from database table, if it exists.
Source: wp-admin/install-helper.php:129
check_column()
Function: Checks that database table column matches the criteria.
Source: wp-admin/install-helper.php:183