在实际开发过程中常用的sql语句, 以user_table为例。
1)创建语句如下:
CREATE TABLE USER_TABLE
(USER_ID VARCHAR2(8),
USER_NAME VARCHAR2(20) ,
USER_SEX VARCHAR2(5) ,
USER_AGE VARCHAR2(50) ,
USER_TEL VARCHAR2(50),
CONSTRAINT MPOS_TEM_LINE_PK PRIMARY KEY (USER_ID));
2)新增语句:
insert into user_table values('1','bakehe','男','高中一班','13351210773');
3)修改语句:
update user_table set user_name='what' where user_id='1'
4)
新增表字段:例如新增一个电话号码的字段
alter table user_table add user_phone char(11);
例如: 新增一个字段,并且给这个字段取一个中文名
alter table reconcav.t_cbs_recon_funds_detail_tmp add CHILD_FUNDS_ID NUMBER(32);
-- Add comments to the columns
comment on column reconcav.t_cbs_recon_funds_detail_tmp.CHILD_FUNDS_ID
is '资金明细表主键ID(同步后)';
-- Add comments to the columns
comment on column reconcav.t_cbs_recon_funds_detail_tmp.CHILD_FUNDS_ID
is '资金明细表主键ID(同步后)';
5)SQL查询like语句:
select * from user_table where user_name like '%bak%';
select user_name,sum(case when user_name='bakehe' then 1 else 0 end ) bake_num,sum(case when user_name='what' then 1 else 0 end ) what_num from user_table group by user_name;
7)SQL去重统计:
select count(user_id),count(distinct user_name),count(distinct user_age) from user_table;
8),范围内的sql查询:
select * from NEWBNK where lbnk_no not in (select lbnk_no from NEWBNK_TMP);
9), SQL查询case when:
select user_id,user_name, (case user_sex when '1' then '男' when '2' then '女' else '人妖' end ) user_sex from user_table;
或者这条语句是这样的:
select user_id,user_name, (case when user_sex='1' then '男' when user_sex='2' then '女' else '人妖' end ) user_sex from user_table;