摘要： 部分索引 char/varchar2太长，全部做索引的话，效率低，浪费存储空间 select avg(length(username)) from 索引统计： show index from table select * from I_S.STATISTICS mysql.innodb_index_ 阅读全文

摘要： mysql> UPDATE financial_sales_order SET ASSIGN_TIME = '2018-05-02 00:00:00' where CUSTOMER_ID=3541535;ERROR 1292 (22007): Truncated incorrect DOUBLE v 阅读全文