问题现象:使用类似以下方式 insert into TXXX@DBL_INTF (colunm_A) select column_A from (select column_A from table a where a.id = b.id oder by a.code) 导出数据到中间表时会出现报错:or 或in 操作数中不允许有外部连接符(+) 顺便说明下,我的查询sql语句里使用(+)作为外连... 查看原文 ...
2. 场景解析 从查询条件中可以看出 token 和 uid 过滤性都非常好,但是由于使用了 or, 需要采用 index merge 的方法才能获得比较好的性能。但在实际执行过程中MySQL优化器默认选择了使用registrationId 上的索引,导致 SQL 的性能很差。 3. 场景优化 我们将SQL改写成union all的形式。 代码语言:javascript 代码运行...
获取选中的值的代码如下 table.addListener(SWT.Selection,newListener() {publicvoidhandleEvent(Event event) {if(event.detail ==SWT.CHECK) { String temp= Pattern.compile("[^0-9]").matcher(event.item.toString()).replaceAll(""); Integer select=Integer.parseInt(temp);if(selectList.contains(select)...
importjava.sql.*;publicclassExample{publicstaticvoidmain(String[]args){try{// 连接数据库Connectionconnection=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","username","password");// 创建Statement对象Statementstatement=connection.createStatement();// 执行查询语句ResultSetresultSet=statemen...
table_name是您从中选择记录的表的名称。 condition1,condition2,等是筛选记录的条件。 使用OR运算符,只要有一个条件为TRUE,记录就会被返回。 以下是一些示例: 选择所有来自德国或西班牙的客户: 代码语言:sql AI代码解释 SELECT*FROMCustomersWHERECountry='Germany'ORCountry='Spain'; ...
The log writing sample programLogSample.javais fairly straightforward in the way the program writes a single record to a file or table as determined by the Logging Service's configuration. In contrast, the log reading sample program is more complex because you can specify that queries are appli...
Find the process named "java" in the table and copy the corresponding PID. Next, open the Debug Console in the top toolbar of the SCM site and run the following command. Replace <pid> with the PID you copied earlier. This command starts a 30-second profiler recording of your Java ...
Table of contents Add Share via Facebook x.com LinkedIn Email Print Virtual Machines - Create Or UpdateReference Feedback Service: Compute API Version: 2024-11-01 The operation to create or update a virtual machine. Please note some properties can be set only during virtual machine creation...
table:查询的表 partitionstype:扫描的方式, all表示全表扫描all : 全表扫描 index: 扫描所有索引range: 索引范围扫描,常见于< <=、>、>=、between、 const: 表最多有一个匹配行, 常见于根据主键或唯一索引进行查询 system: 表仅有一行(=系统表)。
Console Execution logs visible in console with summary table and links to other reports at the end Active Markdown Summary Generates a Markdown summary report file Inactive Flavors To improve run performances, we generate Flavored MegaLinter images containing only the list of linters related to a ...