异常：Subquery returns more than 1 row

背景：

String sql = "SELECt *n" +
                    "FROM emp LEFT JOIN dept on emp.deptno = dept.deptnon" +
                    "WHERe emp.empno = (SELECt empno FROM emp where ename like ?)";

在编写sql语句的时候，子查询查询出来empno>1条的时候，就会报出Subquery returns more than 1 row这个异常

解决方法：在子查询的sql语句前面加一个any就可以了

String sql = "SELECt *n" +
                    "FROM emp LEFT JOIN dept on emp.deptno = dept.deptnon" +
                    "WHERe emp.empno = any(SELECt empno FROM emp where ename like ?)";