CASE:MySQL中的传统条件语句,广泛用于各种版本。 相关优势 可读性:SWITCH和CASE语句使复杂的条件逻辑更易读和维护。 灵活性:可以根据不同的条件执行不同的SQL语句或返回不同的结果集。 性能:在某些情况下,使用SWITCH和CASE可以提高查询性能。 类型 简单CASE:基于单个条件进行判断。
'Return' statement in a Function,Get,or Operator must return a value...Question "An error occurred during local reporting processing. Object reference not set to an instance of an object." "Define query parameters" popup in Dataset properties -> Refersh field, not displayed for Sps in SSD...
最新的归档状态:IN-MEMRY和YESSQL> select t.SEQUENCE#,t.THREAD#,t.APPLIED from V$ARCHIVED_LOG t,(SELECT max(SEQUENCE#) SEQUENCE#,THREAD# FROM V$ARCHIVED_LOG group by THREAD#) t1 where t1.SEQUENCE#=t.SEQUENCE# and t1.THREAD#=t.THREAD#;...
i caught in situation to create a stored procedure and provide the offset feature, that means i needed the pagination support in my stored procedure. There isno direct keywordavailable in SQL Server
ActivityRunsQueryResponse ActivityState AddDataFlowToDebugSessionResponse AmazonMwsLinkedService AmazonMwsObjectDataset AmazonMwsSource AmazonRdsForOracleLinkedService AmazonRdsForOraclePartitionSettings AmazonRdsForOracleSource AmazonRdsForOracleTableDataset AmazonRdsForSqlServerLinkedService AmazonRdsForSqlServerSource Ama...
(message);23//获取用户设备集合24vardevices =QueryUserDevice(model);25//组装数据26varcombineData =CombineData(model, devices, userRole);27//记录日志28Log.MyLog.Info(LogSource +"AddMessageToMongo","保存消息到mongoDB", JsonConvert.SerializeObject(model) +JsonConvert.SerializeObject(devices));29//...
laravel 使用Switch/Case解释SQL数据以避免不必要的华丽调用的最佳实践我可能会使用某种枚举 https://www....
Here is an example of mysql select query uses case to switch the values 1, 2 and 3 to pending, running, and done respectively. [code language=”sql”] SELECT pid, CASE p_status WHEN 1 THEN ‘pending’ WHEN 2 THEN ‘running’ WHEN 3 THEN ‘done’ FROM processes; [/code] You can ...
int a b c d e =0;result=mysql_query(select * from mdl_grade_grades )while($new_row=mysql_fetch_array($result))if($new_row['分数字段']>90){ a++;} elseif(80<$new_row['分数字段']<90){ b++;}elseif直接到成绩<60的 为止 最后echo $a;就是a的个数 $b 就是 ...
laravel 中查看执行的sql 语句 在laravel 框架中,一般使用链式操作来对数据库进行相关的增删改查。那么如何查看我们执行的sql 呢?...对于查询语句来说; 我们可以在链式操作后面加上->toSql();来打印执行的sql 语句。 但是,对于其他的就不适用了。...所以可以采用以下的办法: DB::enableQueryLog(); UserA...