text: -- Add new not null column into SDS table in three steps
  
  -- Step 1: Add the column allowing null
  ALTER TABLE "SDS" ADD "IS_STOREDASSUBDIRECTORIES" CHAR(1);
  
   -- Step 2: Replace the null with default value (false)
  UPDATE "SDS" SET "IS_STOREDASSUBDIRECTORIES" = 'N';
  
  -- Step 3: Alter the column to disallow null values
  ALTER TABLE "SDS" ALTER COLUMN "IS_STOREDASSUBDIRECTORIES" NOT NULL;
  