LEFT JOIN ORG_NODE N ON N.ID=T.NODE_ID ORDER BY T.RN ) WHERE NODE_LEVEL=1) 如果把WITH后面换成SELECT,一点问题没有,但UPDATE就是报错,好奇怪,难道WITH这种间接地写法不能用于UPDATA。 一种说法是:“with必须紧跟引用的select语句,而不是delete,update,merge等” http://www.itpub.net/thread-158564...
SQL update join on 连接更新 http://stackoverflow.com/questions/1293330/how-can-i-do-an-update-statement-with-join-in-sql create table sale ( id int, udid int, assid int ) create table ud ( id int, assid int ) select * from ... Read More SQL sql #include 转载 mb5fdb1365b7...
UPDATE employees SET salary = CASE WHEN job_title = 'Manager' THEN salary * 1.1 WHEN job_title = 'Clerk' THEN salary * 0.95 ELSE salary END; 在上述示例中,我们使用了CASE表达式来根据不同的职位条件更新薪水。如果职位是"Manager",则将薪水增加10%;如果职位是"Clerk",则将薪水减少5%;其他职位不做...
The SQL-99 “WITH clause” is very confusing at first because the SQL statement does not begin with the word SELECT. Instead, we use the “WITH clause” to start our SQL query, defining the aggregations, which can then be named in the main query as if they were “real” tables: WITH...
UPDATESTATEMENT|||1|UPDATE|TB_LHR20160518|||2|PX COORDINATOR|||3|PX SEND QC (RANDOM)|:TQ10000|Q1,00|P->S|QC (RAND)||4|PX BLOCK ITERATOR||Q1,00|PCWC|||5|TABLEACCESSFULL|TB_LHR20160518|Q1,00|PCWP||---12rowsselected. LHR@TEST>EXPLAIN PLANFORUPDATE/*+ PARALLEL (T1,4) */TB_L...
2回答 Oracle中具有连接的Update语句 、 我需要用表A中的一个字段与表B中的一个字段相乘的结果来更新表A中的一列。这在T-SQL中很简单,但是我不能在Oracle中编写正确的语法。我尝试过的: UPDATE TABLE_A SET TABLE_A.COLUMN_TO_UPDATE = (select TABLE_A.COLUMN_WITH_SOME_VALUE * TABLE_B.COL ...
SQL> --Modify multiple rows with a single UPDATE statement; SQL> SQL> SQL> UPDATE Employee 2 SET City ='L.A.' 3 WHERE City = 'New York'; 2 rows updated. SQL> SQL> select * from employee; ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ...
13.Update 语句,如果只更改1、2个字段,不要Update全部字段,否则频繁调用会引起明显的性能消耗,同时带来大量日志。 14.对于多张大数据量(这里几百条就算大了)的表JOIN,要先分页再JOIN,否则逻辑读会很高,性能很差。 15.select count(*) from table;这样不带任何条件的count会引起全表扫描,并且没有任何业务意义,...
1.如果匹配上,将DictB的Desc更新成DictA中对应的字段Desc 首先创建两张表格: {代码...} 解题思路:如果ID匹配得到,则修改(如果ID匹配不到,则插入),类似...
This subquery must select the same number of columns (with compatible data types) as are used in the list of columns in the SET clause. The CURRENT OF cursor clause causes the UPDATE statement to effect only the single row currently in the cursor as a result of the last FETCH. The ...