当您需要对Transactional表或Delta表执行INSERT、UPDATE、DELETE操作时,可以通过MERGE INTO功能将这些操作合并为一条SQL语句,根据与源表关联的结果,对目标Transactional表执行插入、更新或删除操作时,只需要执行一次全表扫描操作,以提高执行效率。 前提条件 执行MERGE INTO操作前需要具备目标Transactional表的读取表数据权限(Se...
syntaxsql [WITH<common_table_expression>[,...n] ]MERGE[TOP( expression ) [PERCENT] ] [INTO]<target_table>[WITH(<merge_hint>) ] [ [AS]table_alias]USING<table_source>[ [AS]table_alias]ON<merge_search_condition>[WHENMATCHED[AND<clause_search_condition>]THEN<merge_matched>] [ ...n ...
*/ override def parsePlan(sqlText: String): LogicalPlan = { val sqlTextAfterSubstitution = substitutor.substitute(sqlText) if (isIcebergCommand(sqlTextAfterSubstitution)) { parse(sqlTextAfterSubstitution) { parser => astBuilder.visit(parser.singleStatement()) }.asInstanceOf[LogicalPlan] } else ...
适用于: Databricks SQL Databricks Runtime 基于源表将一组更新、插入和删除操作合并到目标 Delta 表中。 只有Delta Lake 表支持此语句。 本页包含有关使用 MERGE 命令的正确语法的详细信息。 有关如何使用 操作来管理数据的更多指导,请参阅MERGE。 语法 复制 MERGE [ WITH SCHEMA EVOLUTION ] INTO target_...
In that case, the merged DataSet contains the added schema and data. After merging schemas, the data is merged. When merging a new source DataSet into the target, any source rows with a DataRowState value of Unchanged, Modified, or Deleted are matched to target rows with the same primary...
"array of struct - longer target - on via DeltaSQLConf" ) } Copy link Contributor longvu-dbMar 8, 2024• edited Choose a reasonSpamAbuseOff TopicOutdatedDuplicateResolved I saw a testSET * with schema evolution, should we add a test here with the "WITH SCHEMA EVOLUTION" syntax while ...
This cmdlet merges the data of one or more source partitions into a target partition and deletes the source partitions. Partitions can be merged only if they meet all the following criteria: Partitions are in the same measure group. Partitions are stored in the same mode (MOLAP, HOLAP, and...
The MERGE T-SQL command is now Generally Available! See how the powerful MERGE statement can be leveraged in your Azure Synapse Dedicated SQL pool...
Finally, in accumulate mode we sum Value with a compound assignment operator (+=). Here also we use Device_Id as the key:SQL העתק MERGE INTO [target] t USING (VALUES ...) AS v (Modified_Time,Device_Id,Measure_Value) ON t.Device_Key = v.Device_Id -- Replace and/or...
In that case, the merged DataSet contains the added schema and data. After merging schemas, the data is merged. When merging a new source DataSet into the target, any source rows with a DataRowState value of Unchanged, Modified, or Deleted are matched to target rows with the same primary...