RIGHT JOIN works analogously to LEFT JOIN. To keep code portable across databases, it is recommended that you use LEFT JOIN instead of RIGHT JOIN. # The { OJ ... LEFT OUTER JOIN ...} syntax shown in the join sy
1. sql 2. 错误 select * from a full outer join b on = > 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'outer join b on = ' at line 13. 解决方式: left join + union (去除重复数据)...
SELECTleft_tbl.*FROM{ OJ left_tblLEFTOUTERJOINright_tblONleft_tbl.id=right_tbl.id }WHEREright_tbl.idISNULL; 您可以在{OJ ...}中使用其他类型的连接,例如INNER JOIN或RIGHT OUTER JOIN。这有助于与某些第三方应用程序兼容,但不是官方ODBC语法。 2.9 STRAIGHT_JOIN类似于JOIN,只是左表始终在右表之前读取。
1 OUTER JOIN TABLE_2 是错误的。OUTER JOIN，与 INNER JOIN是对应的。有点区别是语法上INNER JOIN是...
Outer join and inner join syntax is permitted in the outer query specification, and table references may be base tables, derived tables, view references, or common table expressions. In MySQL, a subquery must satisfy these criteria to be handled as a semijoin (or an antijoin, ifNOTmodifies ...
JOIN:添加外部行,如果指定了LEFT JOIN(LEFT OUTER JOIN),则先遍历一遍左表的每一行,其中不在vt2的行会被插入到vt2,该行的剩余字段将被填充为NULL,形成vt3;如果指定了RIGHT JOIN也是同理。但如果指定的是INNER JOIN,则不会添加外部行,上述插入过程被忽略,vt2=vt3(所以INNER JOIN的过滤条件放在ON或WHERE里 执行...
如果 SQL 语句不正确,就会提示 You have an error in your SQL syntax 优化器 经过分析器的词法分析和语法分析后,你这条 SQL 就合法了,MySQL 就知道你要做什么了。但是在执行前,还需要进行优化器的处理,优化器会判断你使用了哪种索引,使用了何种连接,优化器的作用就是确定效率最高的执行方案。 执行器 MySQL...
JOIN ON WHERE 它的执行顺序如下(SQL语句里第一个被执行的总是FROM子句): FROM:对左右两张表执行笛卡尔积,产生第一张表vt1。行数为n*m(n为左表的行数,m为右表的行数 ON:根据ON的条件逐行筛选vt1,将结果插入vt2中 JOIN:添加外部行,如果指定了LEFT JOIN(LEFT OUTER JOIN),则先遍历一遍左表的每一行,其中...
Bug #18003FULL OUTER JOIN (no syntax to cover) Submitted:6 Mar 2006 23:33Modified:7 Mar 2006 23:34 Reporter:Michael ChristenEmail Updates: Status:VerifiedImpact on me: None Category:MySQL Server: DMLSeverity:S4 (Feature request) Version:5.1OS:MacOS (OS-X) ...
JOIN ON WHERE 它的执行顺序如下(SQL语句里第一个被执行的总是FROM子句): FROM:对左右两张表执行笛卡尔积,产生第一张表vt1。行数为n*m(n为左表的行数,m为右表的行数 ON:根据ON的条件逐行筛选vt1,将结果插入vt2中 JOIN:添加外部行,如果指定了LEFT JOIN(LEFT OUTER JOIN),则先遍历一遍左表的每一行,其中...