按一组数字中的第一个数字排序的 MySQL 查询?
如需按一组数字中的第一个数字排序,请使用 ORDER BY SUBSTRING_INDEX()。我们首先创建一个表 -
mysql> create table DemoTable ( SetOfNumbers text ); Query OK, 0 rows affected (0.53 sec)
使用 insert 命令向表中插入一些记录 -
mysql> insert into DemoTable values('245,654,76,89,98'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2000,567,9090,6789'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('1001,90595,657,99'); Query OK, 1 row affected (0.20 sec)
使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable;
这将产生以下输出 -
+--------------------+ | SetOfNumbers | +--------------------+ | 245,654,76,89,98 | | 2000,567,9090,6789 | | 1001,90595,657,99 | +--------------------+ 3 rows in set (0.00 sec)
以下是按一组数字中的第一个数字排序的查询 -
mysql> select *from DemoTable order by cast(substring_index(SetOfNumbers,',',1) as unsigned);
这将产生以下输出 -
+--------------------+ | SetOfNumbers | +--------------------+ | 245,654,76,89,98 | | 1001,90595,657,99 | | 2000,567,9090,6789 | +--------------------+ 3 rows in set (0.00 sec)
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