Help Center/ Data Warehouse Service / More Documents/ Tool Guide (Kuala Lumpur Region)/ DSC/ Migrating MySQL Syntax/ Comment
Updated on 2025-10-14 GMT+08:00
View PDF
Share

Comment

MySQL supports single-line comments caused by number signs (#) or double hyphens (--), while DWS supports only single-line comments caused by double hyphens (--). DSC will replace # with -- for commenting out a single line during migration.

Input

1
2
3
4
5
6
7
 
## comment sample create a table
CREATE TABLE IF NOT EXISTS `public`.`runoob_tbl`(
   `runoob_id` VARCHAR,
   `runoob_title` VARCHAR(100) NOT NULL,
   `runoob_author` VARCHAR(40) NOT NULL,
   `submission_date` VARCHAR
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

Output

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
 
-- comment sample create a table
CREATE TABLE IF NOT EXISTS "public"."runoob_tbl"
(
  "runoob_id" VARCHAR,
  "runoob_title" VARCHAR(400) NOT NULL,
  "runoob_author" VARCHAR(160) NOT NULL,
  "submission_date" VARCHAR
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("runoob_id");
Parent topic: Migrating MySQL Syntax