1、普通分組group by查詢

SELECT

????????"CITY_GDDWBM" AS "citygddwbm",

????????"AREA_GDDWBM" AS "areagddwbm",

????????"GDJMC" AS "gdjmc"

FROM

????????SMBH_IGS_YYTXX

WHERE

????????"CITY_GDDWBM"='0501'

GROUP BY

????????"AREA_GDDWBM","CITY_GDDWBM","GDJMC"

ORDER BY

????????"AREA_GDDWBM" ASC

這種group by分組查詢只能讓3個(gè)字段去重，多了字段的話去重?zé)o效果

2、特殊group by分組查詢

select

????????"YYTTYBM" AS "yyttybm",

????????"CITY_GDDWBM" AS "citygddwbm",

????????"AREA_GDDWBM" AS "areagddwbm",

????????"GDJMC" AS "gdjmc"

from SMBH_IGS_YYTXX where ROWID IN (

????????SELECT MIN(ROWID) FROM SMBH_IGS_YYTXX t GROUP BY t.AREA_GDDWBM

) AND "CITY_GDDWBM"='0501'

這種group by分組查詢能讓多個(gè)字段去重

3、window的oracle數(shù)據(jù)庫(kù)添加用戶并授予權(quán)限

(1)使用sqlplus進(jìn)圖oracle數(shù)據(jù)庫(kù)

sqlplus / as sysdba

(2)創(chuàng)建新用戶

create user yyzj identified by "123456";

(3)授予權(quán)限

grant create session to yyzj;

grant create table to yyzj;

grant create tablespace to yyzj;

grant create view to yyzj;

grant dba to yyzj;

4、Oracle數(shù)據(jù)庫(kù)查看和添加索引

查看索引：select index_name from all_indexes where table_name = 'STRUCTURED_ADDRESS';

添加索引：CREATE INDEX IDX_ADDRESS_CODE ON STRUCTURED_ADDRESS(ADDRESS_CODE);

?

總結(jié)

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