建表的時候為了以後查詢方便，也為了減少資料庫文件的編寫，建表最好加上表的注釋和列的注釋
建表語句:
create table "table_count"
("table_name" varchar2(40 char) not null enable,
"count" varchar2(40 char) not null enable,
"description" varchar2(40 char) not null enable,
"flag" varchar2(40 char) not null enable,
"create_date" varchar2(40 char) not null enable,
primary key ("table_name","create_date")
);comment on table "zx_count" is '每天產生的業務條數';
comment on column "zx_count"."table_name" is '表名';
comment on column "zx_count"."count" is '發生條數';
comment on column "zx_count"."description" is '說明';
comment on column "zx_count"."flag" is '型別標記';
comment on column "zx_count"."create_date" is '業務發生日期';
commit;;
查詢語句：
select *from user_tab_comments where table_name='table_count';
select *from user_col_comments where table_name='table_count';
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