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-1585644-1-1.html 提到可以用MERGE: --wkc168 发表于 2012-3-2 13:28mergeintoc using (se...
3、method_opt: FOR ALL [INDEXED | HIDDEN] COLUMNS[size_clause] FOR COLUMNS [size clause] column[size_clause] [,column [size_clause]...] 字段数据分布不均衡时,建立柱状图(直方图): 柱状图统计信息:索引字段列值建立统计信息 多列统计信息:复合索引列建立统计信息 表达式统计信息:对函数索引键建立统计信...
Table Locks (TM) A table lock, also called a TM lock, is acquired by a transaction when a table is modified by an INSERT, UPDATE, DELETE, MERGE, SELECT with the FOR UPDATE clause, or LOCK TABLE statement. DML operations require table locks to reserve DML access to the table on behalf...
oracle merge同时包含增、删、改 原来一直没注意,merge是可以支持delete,只不过必须的是on条件满足,也就是要求系统支持逻辑删除,而非物理删除。 Using the DELETE Clause with MERGE Statements You may want to cleanse tables while populating or updating them. To do this, you may want to consider using the...
MERGE[TOP ( expression ) [ PERCENT]][INTO]<target_table>[WITH ( <merge_hint> )][[ AS]table_alias ] USING[[ AS]table_alias ]ON<merge_search_condition>[WHEN MATCHED [ AND <clause_search_condition>]THEN<merge_matched>][...n][WHEN NOT MATCHED [ BY TARGET][AND <clause_search_conditi...
3.4 USING clause When you create your using clause with a MERGE statement, keep a few things in mind. First, when you use a sub query in the using clause, it can of course be a table, but it can also be a query against one or more other tables, or even a stored view. The view...
USING [schema .] { table | view | subquery } [t_alias] ON ( condition ) WHEN MATCHED THEN merge_update_clause WHEN NOT MATCHED THEN merge_insert_clause; 1、UPDATE或INSERT子句是可选的 2、UPDATE和INSERT子句可以加WHERE子句 3、在ON条件中使用常量过滤谓词来insert所有的行到目标表中,不需要连接...
Bitmapmerge Bitmapcreate 例如,一个排序操作使用工作区(这时也可叫排序区Sort Area)来将一部分数据行在内存排序;而一个Hash Join操作则使用工作区(这时也可以叫做Hash区 Hash Area)来建立Hash表。如果这两种操作所处理的数据量比工作区大,那就会将输入的数据分成一些更小的数据片,使一些数据片能够在内存中处理,而...
NiFi基于ConvertJsonToSQL实现oracle merge 前言 通过NiFi自定义Processor文章,我们掌握了NiFi自定义开发Processor的流程。 通过基于PutDatabaseRecord的方式实现Oracle mergeg功能。该方案在实现过程中需要较多注意点: 打包时,需要移除依赖nifi-standard-processors依赖,否则会引入编译版本号的新的标准Processor。
First, specify the target table (target_table) in the INTO clause, which you want to update or insert. Second, specify the source of data (source_table) to be updated or inserted in theUSINGclause. Third, specify the search condition upon which the merge operation either updates or inserts...