mysql 字段类型转换 SELECT 1 FROM DUAL WHERE '14508070565939170465'=14508070565939172999 ;SELECT 1 FROM DUAL WHERE '14508070565939170465'=14508070565939171213;为啥上面两条SQL 一句相等 一句不相等 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 select '14508070565939170465'=14508070565939172352;SELECT '14508070565939170465'=14508070565939172999;SELECT '14508070565939170465'+0;SELECT '14508070565939172352'+0;SELECT '14508070565939172999'+0; mysql> select '14508070565939170465'+0;+--------------------------+| '14508070565939170465'+0 |+--------------------------+| 1.4508070565939171e19 |+--------------------------+1 row in set (0.00 sec)mysql> select '14508070565939171213'+0;+--------------------------+| '14508070565939171213'+0 |+--------------------------+| 1.4508070565939171e19 |+--------------------------+1 row in set (0.00 sec)mysql> select '14508070565939172999 '+0;+---------------------------+| '14508070565939172999 '+0 |+---------------------------+| 1.4508070565939173e19 |+---------------------------+1 row in set (0.00 sec)mysql> 看出来了吧 pgsql中保存图片和取出图片 如何操作 mysql如何做触器定时更新? [求]帮忙推荐一款数据库建模工具 请教一个sql的写法,谢谢大家! 问个mysql备份的问题 如何修改表的语言 请教这个视图怎样写 高分求答:mysql为何报如此错误 求大神给解释一下执行计划 mysq数据备份 两表合并sql求助。 请教mysql怎么优化
select '14508070565939170465'=14508070565939172352;
SELECT '14508070565939170465'=14508070565939172999;
SELECT '14508070565939170465'+0;
SELECT '14508070565939172352'+0;
SELECT '14508070565939172999'+0;
mysql> select '14508070565939170465'+0;
+--------------------------+
| '14508070565939170465'+0 |
+--------------------------+
| 1.4508070565939171e19 |
+--------------------------+
1 row in set (0.00 sec)mysql> select '14508070565939171213'+0;
+--------------------------+
| '14508070565939171213'+0 |
+--------------------------+
| 1.4508070565939171e19 |
+--------------------------+
1 row in set (0.00 sec)mysql> select '14508070565939172999 '+0;
+---------------------------+
| '14508070565939172999 '+0 |
+---------------------------+
| 1.4508070565939173e19 |
+---------------------------+
1 row in set (0.00 sec)mysql>
看出来了吧