统计男生数目,含义为:decode()中sex字段为男时,用1代替,然后计算总和 而mysql中没有该函数,替代的有case与if函数。 case函数 同样统计男女生人数,语句如下: SELECT school,COUNT(school) 人数, SUM(CASE WHEN sex='男'THEN 1 ELSE 0 END) 男生数, SUM(CASE WHEN sex='女'THEN 1 ELSE 0 END) 女生数 ...
How to use CASE for IF-THEN logic in SQL SELECT If you want to see the grade for each exam, select thecaseexpression like a regular column: It’s a good idea to give the expression an alias. This is particularly important if thecaseis in a subquery. How to use CASE in the WHE...
select id,ifnull(val,'null') from t1; select id,coalesce(val,'null') from t1; Oracle使用nvl,MySQL使用ifnull或coalesce函数。 ✦ 分支判断 select decode(id,1,'one',2,'two','other') from t1; select case id when 1 then 'one' when 2 then 'two' else 'other' end from t1; Oracle...
Oracle BAM Adapter can communicate with Oracle BAM Server through Enterprise JavaBeans (EJB) (if they are deployed in the same farm), direct Java object invocations (if they are deployed in the same container) or through Web Services (if 1-2 Oracle Fusion Middleware User's Guide for Oracle...
parameter "db_writer_processes". Also consider if asynchronous I/O is appropriate for your architecture. Rationale The value of parameter "db_writer_processes" was "1" during the analysis period. Rationale The value of parameter "disk_asynch_io" was "TRUE" during the analysis ...
In the case of Oracle Cloud Infrastructure, a combination of native monitoring, tagging, and auditing capabilities provide the ability to monitor the full service stack and often automatically remediate abnormalities found outside of specified norms. If you are using third-party monitoring tools today...
you can surface data quickly if a customer makes inquiries. Suppose some customers object to their data being held or will only let a portion of their data be held. In that case, you must be able to easily identify where certain data points live and what’s being shared throughout your ...
背景:要迁移数据库,需要创建与源库相同的表空间,大小与源库相同。由于个别表空间较大,手工添加可能需要写很多的脚本,于是同事通过PL/SQL解决了问题。
//Return the json decoded response body if response status is successful dynamic _returnResponse(Response response) { switch (response.statusCode) { case 200: final Map<String, dynamic>? responseJson = json.decode(response.body.toString()) as Map<String, dynamic>?; ...
(e.g. sar, top, vmstat, etc). If you are running RDA to assist in resolving a service request, the analyst will most likely need the information pertaining to the Oracle owner. The exception to this rule is when RDA is used to assist in a performance related issue. In this case, ...