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文章目录
处理邮箱和手机号
delete FROm all_tables WHERE (email not LIKE "%@%" and phone not REGEXP '^1[3456789][0-9]{9}$');
update all_tables set email='0' WHERE email not LIKE "%@%" ;
update all_tables set phone='0' WHERE phone not REGEXP '^1[3456789][0-9]{9}$';
执行 .sql 文件
msyql -u root -p dbname < xxx.sql
use dbname;
source xxx.sql
select into outfile
用来导出
SELECT * FROM passwd INTO OUTFILE '/tmp/tutorials.txt' FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\r\n';
load data local file
用来导入
msyql -u root -p
use {dbname}
load data local infile "/root/Desktop/wutuopai/from_win10/firstbig_handle.csv" into table firstbig_handle fields terminated by ',' enclosed by '"';
建表不索引
建表时一定不要（请注意是一定不要）建好索引，外键约束等等，可以再数据导入完成后添加各种约束，否则数据的导入将会出错，或特别慢。
加添字段
如果有必须要加添的字段，可以在完成数据导入后用SQL语句加添字段，实例如下：
ALTER TABLE litigationinfo ADD id INT NOT NULL PRIMARY KEY AUTO_INCREMENT FIRST
insert into select
插入另外一张存在的表
Insert into Table2(field1,field2,...) select value1,value2,... from Table1
create as select
根据某个字段拆分成多张表
create table XXX as select * from result where city_id=12
replace
替换某些不正确的字段
update tablename set columnname = replace(cloumnname ,'xx','')