Question

以下代码在SQL Server上正常运行。但是当我在Postgres上尝试它时，它给了我一个错误：表名＆＃34;安全＆＃34;指定不止一次

我尝试了别名，但没有帮助。任何人都可以帮忙吗？

UPDATE security 
SET 
security.review_required_flag = True, 
security.issuer_id = sag_diff."ISSUER_ID", 
security.business_line = sag_diff."BUSINESS_LINE", 
security.cusip = sag_diff."CUSIP", 

FROM security 
INNER JOIN sag_diff 
ON (security.product_id = sag_diff."PRODUCT_ID") 
AND(security.msd_id = sag_diff."MSD_ID") 
AND(security.osp = sag_diff."OSP") 
WHERE security.issuer_id <> sag_diff."ISSUER_ID" 
OR security.business_line <> sag_diff."BUSINESS_LINE" 
OR security.cusip <> sag_diff."CUSIP" 
OR security.industry_sector <> sag_diff."INDUSTRY_SECTOR"

Answer 1

在Postgres中，如果要在FROM子句中使用更新的表，则应为它们提供不同的别名。但是，在您的情况下，您只需要FROM子句中的第二个表：

UPDATE security 
SET 
    review_required_flag = True, 
    issuer_id = sag_diff."ISSUER_ID", 
    business_line = sag_diff."BUSINESS_LINE", 
    cusip = sag_diff."CUSIP"
FROM sag_diff 
WHERE security.product_id = sag_diff."PRODUCT_ID"
AND security.msd_id = sag_diff."MSD_ID"
AND security.osp = sag_diff."OSP"
AND (security.issuer_id <> sag_diff."ISSUER_ID" 
    OR security.business_line <> sag_diff."BUSINESS_LINE" 
    OR security.cusip <> sag_diff."CUSIP" 
    OR security.industry_sector <> sag_diff."INDUSTRY_SECTOR")

PostgreSQL：表名不止一次

1 个答案: