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doc-exports/docs/dws/tool/dws_16_0083.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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COMMENT

The figure below illustrates the process of simplifying COMMENT statements. A complex statement is entered and then simplified through migration.

Input:

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CREATE MULTISET TABLE PDAT.t_tbl_comment
    (
        Data_Dt  DATE           NOT NULL
       ,Data_Src  VARCHAR(4)   NOT NULL
       ,List_Make_Stat  CHAR(1)  
    ) PRIMARY INDEX(Data_Dt,Data_Src) ;
COMMENT ON PDAT.t_tbl_comment IS 'comment test on table';
---------------
REPLACE VIEW  PVW.v_vw_comment AS
LOCKING ROW FOR ACCESS
SELECT Data_Dt, Data_Src, List_Make_Stat       
FROM PDAT.t_tbl_comment;
COMMENT ON PVW.v_vw_comment IS 'comment test on view';
COMMENT ON PVW.v_vw_comment.Data_Dt IS 'comment test on view column';

Output:

COMMENT ON TABLE PDAT.t_tbl_comment IS 'comment test on table';
COMMENT ON VIEW PVW.v_vw_comment IS 'comment test on view';
COMMENT ON COLUMN PVW.v_vw_comment.Data_Dt IS 'comment test on view column';