PostgreSQL merge insert(insert into on conflict) ERRCODE_CARDINALITY_VIOLATION （Ensure that no rows proposed for insertion within the same command hav

2023年1月8日 283次阅读

标签

PostgreSQL , insert into on conflict , merge insert

背景

使用insert into on conflict 合并插入，如果一条SQL语句中，对一个KEY（冲突键，或冲突约束）多次发生冲突时，会报错。

原因：

                         * It is the user's responsibility to prevent this situation from  
                         * occurring.  These problems are why SQL-2003 similarly specifies  
                         * that for SQL MERGE, an except
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