数据仓库服务 GAUSSDB(DWS)-MERGE INTO:示例

时间：2024-07-13 11:24:59

示例

创建进行MERGE INTO的目标：

   
        CREATE TABLE target(a int, b int)WITH(ORIENTATION = COLUMN, ENABLE_HSTORE = ON);
INSERT INTO target VALUES(1, 1),(2, 2);

创建数据源表：

   
        CREATE TABLE source(a int, b int)WITH(ORIENTATION = COLUMN, ENABLE_HSTORE = ON);
INSERT INTO source VALUES(1, 1),(2, 2),(3, 3),(4, 4),(5, 5);

执行MERGE INTO操作：

   
        MERGE INTO target t   
USING source s   
ON (t.a = s.a)   
WHEN MATCHED THEN  
  UPDATE SET t.b = t.b + 1  
WHEN NOT MATCHED THEN  
  INSERT VALUES (s.a, s.b) WHERE s.b % 2 = 0;