pg merge into

PG Merge Into is a SQL statement used to combine data from two tables into a single table. It is a type of data manipulation language (DML) command that allows the user to merge or combine data from one or more tables, based on a specified condition.

The syntax for PG Merge Into is as follows:

MERGE INTO target_table 
USING source_table 
ON join_condition 
WHEN MATCHED THEN 
  UPDATE SET target_column = source_column 
WHEN NOT MATCHED THEN 
  INSERT (target_column1, target_column2, ...) 
  VALUES (source_column1, source_column2, ...) 

In this statement, the `target_table` is the table that will receive the merged data, while `source_table` is the table from which the data will be merged. The `join_condition` specifies the conditions for joining the two tables.

The `WHEN MATCHED` clause is used to update the `target_table` if the specified condition is met, while the `WHEN NOT MATCHED` clause is used to insert new data into the `target_table` if the condition is not met.

PG Merge Into is a powerful tool for combining data from multiple tables and is commonly used in data warehousing and business intelligence applications.