Alias MAX

Just a small request.

Why do we need an alias for a function MAX recover the data
query = "SELECT MAX(changeLogID) AS CID " +
            "FROM ChangeLog " +
            "WHERE beforeUpdate like '%Status:Active%' " +
            "AND beforeUpdate like '%labID:" + labID + "%'";

stmt = conn.createStatement();
rs = stmt.executeQuery(query);

while(rs.next())
{
       System.out.println(rs.getInt("CID"));
}
The above code works fine as I have an alias for MAX. However, the following code generates an error
query = "SELECT MAX(changeLogID) " +
            "FROM ChangeLog " +
            "WHERE beforeUpdate like '%Status:Active%' " +
            "AND beforeUpdate like '%labID:" + labID + "%'";

stmt = conn.createStatement();
rs = stmt.executeQuery(query);

while(rs.next())
{
       System.out.println(rs.getInt("changeLogID"));
}

java.sql.SQLException: Invalid column name
Oracle: 91

MAG says:
Just a small request.

Why do we need an alias for a function MAX recover the data

query = "SELECT MAX(changeLogID) AS CID " +
"FROM ChangeLog " +
"WHERE beforeUpdate like '%Status:Active%' " +
"AND beforeUpdate like '%labID:" + labID + "%'";

stmt = conn.createStatement();
rs = stmt.executeQuery(query);

while(rs.next())
{
System.out.println(rs.getInt("CID"));
}

The above code works fine as I have an alias for MAX. However, the following code generates an error

query = "SELECT MAX(changeLogID) " +
"FROM ChangeLog " +
"WHERE beforeUpdate like '%Status:Active%' " +
"AND beforeUpdate like '%labID:" + labID + "%'";

stmt = conn.createStatement();
rs = stmt.executeQuery(query);

while(rs.next())
{
System.out.println(rs.getInt("changeLogID"));
}

java.sql.SQLException: Invalid column name

Oracle: 91

changeLogID can be multiple where as Max (changeLogID), which is CID is one. That's why you get en error.

Tags: Database

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