MySql的插入进SELECT SUM

Question

表一个数据 - po_header

 
PO_ID PROJ_ID SUP_ID TOT_SUM   SUBM_DATE 
32  5555 AccAYOU 99.00   2016-11-29 
33  5555 AccAYOU 990.00   2016-11-29 
34  25412 AccAYOU 248778595.08 2016-11-30 

表中的两个数据 - po_details

 
PO_ID amount 
32  110.00 
33  1500000.00 
34  565079266.00 
34  1.00 

如何运行下面的SQL？

INSERT INTO po_header (TOT_SUM) VALUES (SELECT SUM(amount) 
    FROM po_details WHERE PO_ID = '34') WHERE PO_ID ='34'; 

Answer 1

即使是未正确语法但是这是你想要的东西：

UPDATE po_header h 
SET TOT_SUM = (Select sum(amount) From po_details d Where d.po_id = h.po_id) 

Answer 2

 
UPDATE po_header SET TOT_SUM = (SELECT SUM(amount) FROM po_details WHERE PO_ID='34') WHERE PO_ID='34';