•condition是 WHERE 子句用于过滤符合条件的记录。 三、Oracle UPDATE LEFT JOIN 示例 假设我们有两张表,一张是employees表,另一张是departments表。我们需要根据departments表中的数据来更新employees表中的department_id列。 步骤1:创建示例表 首先,我们需要创建并插入一些示例数据到employees和departments表中。下面是...
1 update:update dept set dname = 'ORACLE'where deptno in (select a.deptno from emp a left join dept b on a.deptno = b.deptno);2 delete:delete dept where deptno in (select a.deptno from emp a left join dept b on a.deptno = b.deptno);
WHERE E.USERNAME = (SELECT X.USERNAME FROM USER X WHERE E.USERNAME = X.USERNAME and X.ORG_ID = ‘B26603C4BB9B0042E0430ABC694C0042’) 写法二: UPDATE USER_INFO E SET E.TOP_SCORE = 230 WHERE exists (SELECT X.USERNAME FROM USER X WHERE E.USERNAME= X.USERNAME and X.ORG_ID = ‘...
LEFT JOIN B ON A.B_ID = B.B_ID SET A.A_NAME = B.B_NAME;sqlserver update A set A_NAME = B.B_NAME from A left join B ON A.B_ID = B.B_ID sqlserver注意前⾯两个A没有别称 oracle UPDATE (SELECT a.cont AS acont FROM A t LEFT JOIN B a ON t.id = a.id WHERE a....
你好,这个是可以的,其实他们的用法和select的一样,只不过是前面的部分是update;后面的是set 后面的where语句都是通用的
oracle update left join查询 对于有的更新语句,要更新的表可能条件不够,需要用到left join关联其他表, 但是不能直接关联,否则报错:错误如下: updateimim_gireqbillitems gileftjoinimim_gireqbills gong.guid=gi.guidsetgi.quantity=(selectsum(gi2.quantity)fromimim_gireqbillitems gi2leftjoinimim_gireqbills...
3 WHERE M.NAME=N.NAME(+); 1. 1. NAME NAME SEX GRADE 1. --- --- --- --- 1. kerry kerry male 3 1. jimmy jimmy male 2 1. tina female 1. wendy female 1. SQL> 1. LEFT OUTER JOIN的韦恩图如下所示: 3右外连接:RIGHT JOIN 右外连接又叫右连接:...
WHERE condition; 这里,table_name指定了要更新的表名,SET子句后跟一列或多列要更新的新值,WHERE子句指定了哪些记录需要被更新。 Oracle中JOIN语句的基本用法 JOIN语句用于结合两个或多个表中的数据。在Oracle中,你可以使用多种类型的JOIN,如INNER JOIN、LEFT JOIN、RIGHT JOIN等。以下是INNER JOIN的基本用法示例...
update student set sage=19 where sid='S001'; delete语法: delete from 表名 where 条件 如果不加条件则删除表中全部记录 例:delete from student where sid='S005'; delete from student; drop:删除表结构和表数据 delete:只能删除表数据,无法删除表结构 ...
select aid from agents where percent <=all (select percent from agents); (2)in/exists 子查询 EXISTS用于检查subquery是否至少会返回一行数据,subquery 是一个受限的 SELECT 语句 (不允许有 COMPUTE 子句和 INTO 关键字) 返回一个结果集,EXISTS子句根据其内查询语句的结果集空或者非空,返回一个布尔值True或...