Checking STRUCTURE phase 2
ALTER TABLE operation_list ADD `operation_note` text NULL
ALTER TABLE operation_list ADD `chronic_disease` VARCHAR(250) NULL
ALTER TABLE icd9cm2 MODIFY COLUMN `code` VARCHAR(9)
ALTER TABLE icd102 MODIFY COLUMN `code` VARCHAR(9)
ALTER TABLE dttm MODIFY COLUMN `icd9cm` VARCHAR(9)
ALTER TABLE dttm MODIFY COLUMN `icd10` VARCHAR(9)
Checking STRUCTURE phase 1