摘要:
![](https://img2018.cnblogs.com/blog/1019257/201912/1019257-20191224171903454-1078307555.png) 阅读全文
摘要:
| | Q uery | | | | | | | | | : | | 1 | SELECT 和 SELECT \ 语句 | SELECT LastName,FirstName FROM Persons | | | | 2 | SELECT DISTINCT 语句 | SELECT DISTINCT 阅读全文