他给的示例SQL如下： select HName,case when IsEnable=1 then '启用' else '停用' from tb_User ...
使用变量将SQL更新为NULL 在select语句中将SQL CASE设置为多个变量 如果SQL Server CASE值为NULL,则不返回任何内容 在SQL LIKE语句中使用变量 在case语句中将列设置为null PL/SQL ORA-01400:使用CASE时无法插入NULL 在赋值为null之前检查变量是否为null? 在python中使用变量的SQL Like语句 使用PHPUnit时,全...
3、根据业务需求画Use Case视图 Note:从左侧的ToolBox工具栏中 选择一些Use Case的元素,直接拖曳左边的Element,到右边的工作区,就可以把Element放到咱们的Use Case试图中。 A、拖曳两个Actor 元素到工作区,分别命名为“供应商”“商品开发人员” B、拖曳三个Use Case元素到工作区,分别命名为“商品提报”“CSV档导...
Use CASE WHEN statement in SELECT /* mysql> SELECT Name, RatingID AS Rating, -> CASE RatingID -> WHEN 'R' THEN 'Under 17 requires an adult.' -> WHEN 'X' THEN 'No one 17 and under.' -> WHEN 'NR' THEN 'Use discretion when renting.' -> ELSE 'OK to rent to minors.' -> ...
SQL SUM– If you want to get the sum of all values of a specified column or expression then you can use SQL function SUM(). Let me show you a use case in which I will use all the above aggregate functions to return their respective values as shown below. ...
[NINUSIKIJI] = CASE WHEN( P.[NINUSIKIJI] IS NULL OR P.[NINUSIKIJI] = '' ) THEN @NINUSIKIJI ELSE P.[NINUSIKIJI] END, [NINUSISECCD] = (CASE WHEN( P.[NINUSISECCD] IS NULL OR P.[NINUSISECCD] = '' ) THEN @NINUSISECCD ...
In this case: the client can generate the SQL statement in chunks of 16Mbyte and write them to the network *(memory usage)* the server waits until the full 1GByte is received *(execution delay)* before it can start parsing and executing it ...
We can use SQL SELECT Distinct to find unique references of data. For example, we have a result set that shows different rows of a table and each row consists of columns. Now sometimes we are more interested in unique patterns of the data rather than the data itself which is one of the...
However, in this case you need to have small and self-contained application where there are minimal interaction between products and other entities such as orders, customers, suppliers, etc. If these related entities are stored in the relational database, NoSQL is not an option because you ...
Use Case 1: Creating a Current Health of Daily Jobs Report in Microsoft Excel Use Case 2: Creating Charge Back Reports in Excel Use Case 3: Creating a Daily Operational Report in SQL Server Reporting Services Working with the Web Service Interface ...