将一列的值从一个表更新到另一个

Question

I have two tables:-

Source Table: ACT_DT with columns ( CUST_NAME, ACC_TYPE, CUST_STAT, SB_ACT_DT );

Target Table: ORG_DT with columns ( CUST_NAME, ACC_TYPE, CUST_STAT, SB_ACT_DT );

The column SB_ACT_DT in the Target table has all null values. I need to update that column with the values of same column as in source table. The condition to be checked are:

ACC_TYPE='Billing' and CUST_STAT='Active'.  

The Target table has to be updated only if the above conditions are found true.

How can I do it? Your help is appreciated.

Answer 1

What you are looking for is Update table using Join

UPDATE ORG_DT o
JOIN ACT_DT a
ON o.CUST_NAME=a.CUST_NAME
   AND
  o.ACC_TYPE=a.ACC_TYPE
   AND
  o.CUST_STAT=a.CUST_STAT   
SET o.SB_ACT_DT = a.SB_ACT_DT
WHERE a.ACC_TYPE='Billing' AND a.CUST_STAT='Active'