How to select a row having a column with min value - oracle

Question

I am using oracle database and spring ibatis.
I have a query which will return two results from that i need to get a record which has minimum value on a column.
In Oracle i do that using below query:
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);
I have converted this query to like below in spring ibatis
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#);
But this throws me below error:
**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]**
Can anyone please help me in converting this query from oracle to spring ibatis?

Answer 1

Too long for a comment:
You can find the row(s) with the minimum value for a given column using the RANK (or DENSE_RANK) analytic function (and this does not need the extra correlated query):
SELECT *
FROM (
SELECT root.*,
RANK() OVER ( ORDER BY MOL_WEIGHT ) AS rnk
FROM ANUMBER$ROOT ROOT
WHERE ROOT_NUMBER=1546305
)
WHERE rnk = 1;