error_on_nondeterministic_update

值 (粗體為預設值)

false、true

描述

指定每列具有多個相符項目的 UPDATE 查詢是否會傳回錯誤。

範例

SET error_on_nondeterministic_update TO true;
            
CREATE TABLE t1(x1 int, y1 int);

CREATE TABLE t2(x2 int, y2 int);

INSERT INTO t1 VALUES (1,10), (2,20), (3,30);

INSERT INTO t2 VALUES (2,40), (2,50);

UPDATE t1 SET y1=y2 FROM t2 WHERE x1=x2; 

ERROR: Found multiple matches to update the same tuple.