MySQLIntegrityConstraintViolationException：where子句中的列“ adno”不明确

Question

I want to get the data from two tables studentinfo ans studentmarks .

I use Join s with where clause but it will show:

ConstraintViolationException: Column 'adno' in where clause is ambiguous

Here is my code snippet

String adno = jTextField10.getText();

String s = "Select si.n,
                   si.class,
                   sm.acc,
                   sm.bst,
                   sm.eco from si Left Join sm 
                   ON si.adno = sm.adno 

                   where adno ='" + adno + "';";

Answer 1

You didn't tell which adno column should be used WHERE clause.

Substitute where adno with where studentinfo.adno

Answer 2

A good programmer, write pieces of code that are, Conventional, Readable, Scalable, Commented and Indented.

In your case, do this,(mainly use aliases , and yes si.adno solves it)

SELECT si.name,
       si.class,
       sm.acc,
       sm.bst,
       sm.eco 
FROM studentinfo si 
LEFT JOIN studentmarks sm 
ON si.adno = sm.adno 
WHERE si.adno ='" + adno + " //qualifying the where condition