如何選擇具有最小值的列的行

Question

我正在使用oracle數據庫和spring ibatis。

我有一個查詢，將返回兩個結果，我需要獲得一列有最小值的記錄。

在Oracle我做，使用下面的查詢：

SELECT * 
FROM ANUMBER$ROOT ROOT 
WHERE ROOT.ROOT_NUMBER=1546305 
AND ROOT.MOL_WEIGHT = (SELECT MIN(MOL_WEIGHT) 
         FROM ANUMBER$ROOT 
         WHERE ROOT_NUMBER=1546305); 

我已經轉換此查詢下方喜歡在春季ibatis的

SELECT * 
FROM ANUMBER$ROOT ROOT 
WHEREe ROOT.ROOT_NUMBER= #value# 
AND ROOT.MOL_WEIGHT = (SELECT MIN(MOL_WEIGHT) 
         FROM ANUMBER$ROOT 
         WHERE ROOT_NUMBER= #value#); 

但是，這將引發我下面的錯誤：

**log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext). log4j:WARN Please initialize the log4j system properly. Exception in thread "main" org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation; uncategorized SQLException for SQL []; SQL state [null]; error code [0];
--- The error occurred in abbott/gprd/compoundInfo/dao/ibatis/LibraCompoundInformationLookup.xml.

--- The error occurred while preparing the mapped statement for execution.
--- Check the selectCompoundInfoByRootNumber.
--- Check the SQL statement.
--- Cause: java.util.NoSuchElementException; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in abbott/gprd/compoundInfo/dao/ibatis/LibraCompoundInformationLookup.xml.

--- The error occurred while preparing the mapped statement for execution.
--- Check the selectCompoundInfoByRootNumber.
--- Check the SQL statement.
--- Cause: java.util.NoSuchElementException Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in abbott/gprd/compoundInfo/dao/ibatis/LibraCompoundInformationLookup.xml.

--- The error occurred while preparing the mapped statement for execution.
--- Check the selectCompoundInfoByRootNumber.
--- Check the SQL statement.
--- Cause: java.util.NoSuchElementException at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:104) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:566) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:541) at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106) at org.springframework.orm.ibatis.SqlMapClientTemplate$1.doInSqlMapClient(SqlMapClientTemplate.java:243) at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:193) at org.springframework.orm.ibatis.SqlMapClientTemplate.queryForObject(SqlMapClientTemplate.java:241) at abbott.gprd.compoundInfo.dao.ibatis.CompoundInformationDao.getCompoundInformationForRootNumber(CompoundInformationDao.java:66) at abbott.gprd.compoundInfo.dao.ibatis.CompoundInformationDao.main(CompoundInformationDao.java:183) Caused by: java.util.NoSuchElementException at java.util.StringTokenizer.nextToken(StringTokenizer.java:332) at com.ibatis.sqlmap.engine.mapping.sql.simple.SimpleDynamicSql.processDynamicElements(SimpleDynamicSql.java:90) at com.ibatis.sqlmap.engine.mapping.sql.simple.SimpleDynamicSql.getSql(SimpleDynamicSql.java:45) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:168) ... 9 more ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2 JDWP exit error AGENT_ERROR_NO_JNI_ENV(183): [../../../src/share/back/util.c:820]**

任何人都可以請幫我轉換這個查詢從甲骨文到春季ibatis？

Answer 1

的評論太長：

您可以找到使用RANK（或DENSE_RANK）解析函數在給定列中的最低值的行（S）（這並不需要額外的相關查詢） ：

SELECT * 
FROM (
    SELECT root.*, 
     RANK() OVER (ORDER BY MOL_WEIGHT) AS rnk 
    FROM ANUMBER$ROOT ROOT 
    WHERE ROOT_NUMBER=1546305 
) 
WHERE rnk = 1;