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doc-exports/docs/dws/tool/dws_16_0129.html
Lu, Huayi 27019c2991 DWS TOOL 830.201 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:35:25 +00:00

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COMMENT

In MySQL, COMMENT is a comment for a table. In GaussDB(DWS), this attribute can be used to modify table definition. During migration using DSC, additional table attribute information is added.

Input

CREATE TABLE `public`.`runoob_alter_test`(
    `dataType1` int NOT NULL AUTO_INCREMENT,
`dataType2` FLOAT (10,2) COMMENT'dataType2 column',
    PRIMARY KEY(`dataType1`)
) comment='table comment'; 

ALTER TABLE `public`.`runoob_alter_test` COMMENT 'table comment after modification';
ALTER TABLE `public`.`runoob_alter_test` ADD INDEX age_index(dataType2) COMMENT' index';

Output

CREATE TABLE "public"."runoob_alter_test"
(
  "datatype1" SERIAL NOT NULL,
"datatype2" REAL COMMENT 'dataType2 column',
  PRIMARY KEY ("datatype1")
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype1")
COMMENT 'Comment of the table';
ALTER TABLE `public`.`runoob_alter_test` COMMENT 'table comment after modification';
CREATE INDEX "age_index" ON "public"."runoob_alter_test" ("dataType2") COMMENT' index';