它在timestamp列的类型转换上使用窗口函数row_number（）：可以使用相关子查询：我知道这是我的sql中的一个实现，但我尝试sql server只是为了好玩，这个查询提供了必要的输出：
active transactions, run these commands:'ASRecommendation;SELECT'DBCC OPENTRAN ('+QUOTENAME(@dbname) +')'ASFindOpenTran;SELECT'SELECT database_id, db_name(database_id) AS dbname, database_transaction_begin_time, database_transaction_state, database_transaction_log_record_count, ...
active transactions, run these commands:'ASRecommendation;SELECT'DBCC OPENTRAN ('+QUOTENAME(@dbname) +')'ASFindOpenTran;SELECT'SELECT database_id, db_name(database_id) AS dbname, database_transaction_begin_time, database_transaction_state, database_transaction_log_record_count, database_transaction...
record in SCD history in last 6 months, based on matching fact */ INNER JOIN DimLocation FOR SYSTEM_TIME BETWEEN @sixMonthsAgo AND @now AS DimLocation_History ON DimLocation_History.LocationId = F.LocationId AND F.FactDate BETWEEN DimLocation_History.ValidFrom AND DimLocation_History.Valid...
SELECT*FROM表名称 在结果集(result-set)中导航: 由SQL 查询程序获得的结果被存放在一个结果集中。大多数数据库软件系统都允许使用编程函数在结果集中进行导航,比如:Move-To-First-Record、Get-Record-Content、Move-To-Next-Record 等等。 2.SELECT DISTINCT 语句 ...
Date)ORDERBYSaleDateASC)ASFirstRow,ROW_NUMBER()OVER(PARTITIONBYYEAR(SaleDate),MONTH(SaleDate)ORDERBYSaleDateDESC)ASLastRowFROMSales)SELECTId,SaleDate,Amount,CASEWHENFirstRow=1THEN'First Record'WHENLastRow=1THEN'Last Record'ENDASRecordTypeFROMRankedSalesWHEREFirstRow=1ORLastRow=1ORDERBYSaleDate;...
order by 1,2 --- by列号 stockname = (select stockname from stock_information where stockid = 4) --- 子查询 --- 除非能确保内层select只返回一个行的值, --- 否则应在外层where子句中用一个in限定符 select distinct column_name form table_name --- distinct指定检索独有的列值,不重复 select...
DML语句,即数据操纵语句(Data Manipulation Languages)。其关键字包括:INSERT、UPDATE、DELETE、SELECT。 插入记录 INSERT[LOW_PRIORITY|DELAYED|HIGH_PRIORITY]INTOtablename [(colname1[, ...])]VALUES (record1_value1[, ...])[, ...] [ONDUPLICATE KEYUPDATEcolname2=value2[, ...]] ...
Note that the CreationDate column also includes time, so the below query will only get data until 2009-12-31 at midnight. The rest of the data for that last day will not be included. SELECT * FROM [StackOverflow2010].[dbo].[Posts] ...
可通过拓展数据源函数特性来自定义数据源,如实现 select * from mysql(...)。 例: import net.sf.jsqlparser.statement.select.FromItem; import org.jetlinks.reactor.ql.ReactorQLContext; import org.jetlinks.reactor.ql.ReactorQLMetadata; import org.jetlinks.reactor.ql.ReactorQLRecord; import org.jetlinks...