文档解释
ORA-39753: unsupported use of subquery in PARTITIONED OUTER JOIN condition
Cause: An attempt was made to use subquery in PARTITIONED OUTER JOIN condition.
Action: Remove subquery from the join condition.
ORA-39753（ unsupported use of subquery in PARTITIONED OUTER JOIN condition）错误指的是，在分割外连接条件中使用子查询是不受支持的。
官方解释
ORA-39753在分割外连接条件中使用子查询是不受支持的。
常见案例
SELECT * FROM table1
LEFT OUTER JOIN table2
ON table1.a = table2.a
WHERE table2.a IN (SELECT a FROM table3)
一般处理方法及步骤
1. 修改查询，使用JOIN替代WHERE子句中包含子查询的分割外连接：
SELECT * FROM table1
LEFT OUTER JOIN table2
ON table1.a = table2.a
LEFT OUTER JOIN table3
ON table3.a = table2.a
2. 针对子查询中的条件进行优化：
SELECT * FROM table1
LEFT OUTER JOIN table2
ON table1.a = table2.a
LEFT OUTER JOIN table3
ON table3.a = table2.a
WHERE EXISTS (SELECT a FROM table3 WHERE table2.a = table3.a)
