Sql语句中的inner join on,array都是什么意思 sql中inner join on 和一般的多表查询有什么区...

SQL\u8bed\u53e5\u4e2d\u7684\u201cINNER JOIN\u201d\u662f\u4ec0\u4e48\u610f\u601d\u554a\uff1f

\u5185\u8054\u63a5\u3002

JOIN \u5206\u4e3a\u5185\u8fde\u63a5\uff0c\u5916\u8fde\u63a5\uff08\u5de6\u5916\u8fde\u63a5\uff0c\u53f3\u5916\u8fde\u63a5\uff0c\u5168\u5916\u8fde\u63a5\uff09

\u5185\u8fde\u63a5\uff1a SELECT A.* FROM A INNER JOIN B ON A.ID=B.ID

\u5de6\u5916\u8fde\u63a5\uff1a SELECT A.* FROM A LEFT JOIN B ON A.ID = B.ID

\u53f3\u5916\u8fde\u63a5\uff1a SELECT A.* FROM A RIGHT JOIN B ON A.ID = B.ID

\u5168\u5916\u8fde\u63a5\uff1a SELECT A.*, B.* FROM A FULL OUTER JOIN B ON A.ID = B.ID

\u6ca1\u4ec0\u4e48\u533a\u522b\uff0c\u5728\u6267\u884c\u65b9\u5f0f\u548c\u6548\u7387\u4e0a\u90fd\u662f\u4e00\u6837\u7684
\u53ea\u662f\u4e66\u5199\u7684\u65b9\u5f0f\u4e0d\u540c
\u57fa\u672c\u4e0a\u8fd9\u4e2ainner join \u662f\u4e3a\u4e86\u533a\u522b left join ,right join\u7b49\u7684\u4e00\u4e2a\u5199\u6cd5
\u800c\u53e6\u5916\u90a3\u79cd\u4e0d\u662fjoin\u7684\u5199\u6cd5\uff0c\u53ea\u80fd\u7b49\u540c\u4e8einner join

inner join 是sql的基本关联语法
例如表a,表b，2个表有关联字段
一般是这样写
select *
from a inner join b on a.id=b.id
2个表关联查询相关数据的意思
array是数组的意思，在sql里面是没有数组的，
估计你说的是放在from 后面的一个表名

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