sql技巧(增册改查)

  1 select * from wyl.t;
  2 --将数据从t1导入t2
  3 insert into t2(c1,c2) select c1,c2 from t1 where c1= xx and c2 = xx order by c1;
  4 --使用to表的name来更新t1表的name
  5 update t1 as a,t2 as b set a.name = b.name where a.tid = b.id;
  6 --两表关联更新
  7 update t_role_user as a,
  8 (
  9    select
 10    id
 11    from
 12    t_user
 13    where
 14    departid in(
 15       select
 16       id
 17       from
 18       t_depart
 19       where
 20       length(org_code) = 9
 21    )
 22 ) as b
 23 set a.roleid = '12345'
 24 where
 25  a.userid = b.id;
 26 --自己和自己关联一更新
 27 update t_depart as a,
 28 (
 29    select
 30    id,
 31    substring(org_code,1,6) org_code
 32    from
 33    t_depart
 34    where
 35    length(org_code)=8
 36    and parent_depart_id is not null
 37 ) as b
 38 set a.parent_depart_id = b.id
 39 where
 40 substring(a.org_code,1,6) =
 41 b.org_code
 42 --两表关联删除，将删除两表中关联id并且t2表name为空的两表记录
 43 delete a,b from t1 as a left join t2 as b on a.tid = b.id where b.name is null;
 44 --奖统计结果插入到表
 45 insert into se_stat_org (
 46     record_date,
 47     org_id,
 48     org_name,
 49     sign_cont_count,
 50     sign_arri_cont_count,
 51     sign_cont_money,
 52     sign_arri_cont_money,
 53     total_arri_cont_count,
 54     total_arri_money,
 55     publish_total_count,
 56     project_count
 57 ) select
 58 *
 59 from
 60 (
 61     select
 62     '2012-06-09' record_date,
 63     parent_org_id,
 64     parent_org_name,
 65     sum(sign_cont_count) sign_cont_count,
 66     sum(sign_arri_cont_count) sign_arri_cont_count,
 67     sum(sign_cont_money) sign_cont_money,
 68     sum(sign_arri_cont_money) sign_arri_cont_money,
 69     sum(total_arri_cont_count) total_arri_cont_count,
 70     sum(total_arri_money) total_arri_money,
 71     sum(publish_total_count) publish_total_count,
 72     sum(project_count) project_count,
 73     from se_stat_user
 74     where date_format(record_date, '%y-%m-%d') = '2012-06-09'
 75     group by parent_org_id
 76 ) m
 77
 78 --三表关联更新
 79 update se_stat_user a,
 80 (
 81     select
 82     user_id,
 83     sum(invest_org_count + financial_org_count + intermediary_org_count + enterprise_count) as common_count
 84     from se_stat_user
 85     where date_format(record_date, '%y-%m-%d') = '2012-06-09'
 86     group by user_id
 87 ) b,
 88 (
 89     select
 90     user_id,
 91     sum(establish_count + stock_count + merger_count + achieve_count) as project_count
 92     from se_stat_user
 93     where date_format(record_date, '%y-%m-%d') = '2012-06-09'
 94     group by user_id
 95 ) c
 96 set a.common_count = b.common_count, a.project_count = c.project_count
 97  where a.user_id = b.user_id
 98    and a.user_id = c.user_id
 99    and date_format(a.record_date, '%y-%m-%d') = '2012-06-09'
100 --带条件的关联更新
101 update se_stat_user a,
102 (
103     select
104     p.channel,
105     count(p.cont_id) as cont_count,
106     c.cust_mgr_id
107     from
108     (
109         select
110         channel,
111         cont_id
112         from sk_project
113         where project_status = 6
114         and date_format(audit_time, '%y-%m-%d') = '2012-06-11'
115     ) p
116     inner join se_contract c on p.cont_id = c.cont_id
117     group by p.channel, c.cust_mgr_id
118 ) b
119 set
120     a.stock_count = case when b.channel = 2 then b.cont_count else 0 end,
121     a.establish_count = case when b.channel = 3 then b.cont_count else 0 end,
122     a.achieve_count = case when b.channel = 4 then b.cont_count else 0 end,
123     a.brand_count = case when b.channel = 5 then b.cont_count else 0 end,
124     a.merger_count = case when b.channel = 6 then b.cont_count else 0 end
125 where
126   a.user_id = b.cust_mgr_id
127     and date_format(a.record_date, '%y-%m-%d') = '2012-06-11'
128 --加索引
129 alter table project add index index_user_id (user_id),
130 add index index_project_status (project_status);
131 --删除列
132 alter table project drop column project_status,
133 drop column expect_return,drop column currency;
134 --增加列
135 alter table project
136 add column dict_id int default null comment 'xxx' after project_site,
137 add column introduce text default null comment 'xx' after dict_id,
138 add column stage int default null comment 'xx' after id,
139 add column attach_uri varchar(8) default null comment 'xxx' after introduce;
140 --修改列，一般用modify修改数据类型，change修改列名
141 alter table project change dict_id dict_id1 int not null,
142 modify project_status tinyint not null comment 'xxx';
143 --1.总体累计统计 对员工的工资，人数进行总体累计统计
144 select
145     employee_id,
146     sum(salary) over(order by employee_id) sal,
147     count(*) over (order by employee_id) num,
148     sum(salary) over() total_sal,
149     count(*) over() total_num,
150   from hr.employees;
151 --2.分组累计统计 对各个部门中的员工工资，人数进行分组累计统计
152 select
153       department_id,
154       employee_id,
155       sum(salary) over(partition by department_id order by employee_id) sal,
156       count(*) over(partition by department_id order by employee_id) sum
157   from hr.employees;