Function Return Type Description DATE string DATE Parse the date string (yyyy-MM-dd) to a SQL date. TIME string TIME Parse the time string (HH:mm:ss) to the SQL time. TIMESTAMP string TIMESTAMP Convert the time
Apache Flink Temporal Table 我们不止一次的提到Apache Flink遵循ANSI-SQL标准,Apache Flink中Temporal Table的概念也源于ANSI-2011的标准语义,但目前的实现在语法层面和ANSI-SQL略有差别,上面看到ANSI-2011中使用FOR SYSTEM_TIME AS OF的语法,目前Apache Flink中使用LATERAL TABLE(TemporalTableFunction)的语法。这一点...
Exposing the stream as atemporal table functionthat maps each point in time to a static relation. Going back to our example use case, a temporal table is just what we need to model the conversion rate data such as to make it useful for point-in-time querying. Temporal table functions are...
Apache Flink遵循ANSI-SQL标准,Apache Flink中Temporal Table的概念也源于ANSI-2011的标准语义,但目前的实现在语法层面和ANSI-SQL略有差别,上面看到ANSI-2011中使用FOR SYSTEM_TIME AS OF的语法,Apache Flink在早期版本中仅仅支持LATERAL TABLE(TemporalTableFunction)的语法,当前flinkv14版本中已经支持FOR SYSTEM_TIME AS...
(); //执行sql preparedStatement = connection.prepareStatement(deleteSql); preparedStatement.execute(); //归还连接 connection.close(); } catch (SQLException e) { log.info("TableProcessFunction invoke deleteTable failed ", e); throw new RuntimeException(e); } finally { if (preparedStatement !=...
This notion appears in databases in three guises. The first use of now is as a function within queries, views, assertions, etc. For instance, in SQL, CURRENT_DATE within queries, etc., returns the current date as an SQL DATE value; CURRENT_TIME and CURRENT_TIMESTAMP are also available....
In diesem Beispiel erstellen Sie ein sechsmonatiges gleitendes Fenster mit monatlichen Unterteilungen, beginnend im September 2023.SQL Kopie BEGIN TRANSACTION /*Create partition function*/ CREATE PARTITION FUNCTION [fn_Partition_DepartmentHistory_By_ValidTo] (DATETIME2(7)...
Table table = tableEnv.sqlQuery(sql); tableEnv.toAppendStream(table,Row.class).print(); //6、开始执行 tableEnv.execute(Test.class.getSimpleName()); } /** * 解析Kafka数据 */ static class BrowseKafkaProcessFunction extends ProcessFunction<String, UserBrowseLog> { ...
为了证明SQL Server只要求主表和历史表的字段结构和约束一致,不要求分区和压缩选项一致,这里做一个实验 CREATEPARTITIONFUNCTIONmyPF (int)ASRANGELEFTFORVALUES(1,100,1000);GOCREATEPARTITION SCHEME myPS1ASPARTITION myPFTO([primary],[primary],[primary],[primary]);--DROP TABLE dbo.TemporalTableTEST7_History...
在Flink中,通过TemporalTableFunction实现对temporal table的访问,必须定义主键和时间戳属性,主键确定覆盖哪些行,时间戳确定有效的时间,也就是表的数据版本。 时态表代码开发: 数据源:ratesHistory.csv RMB,114,2015-01-01 00:00:00 RMB,115,2015-01-03 00:00:00 RMB,116,2015-01-19 00:00:00 Euro,119,...