How to query with multiple tables

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My Project contain 2 tables.
DetailsTB and ImageTB

Now DetailsTB contain Primary key as a Composite Key of two column of Receipt,Passenger_Name
e.g. PRIMARY KEY(Receipt, Passenger_Name)

and this FOREIGN KEY(Receipt, Passenger_Name) is Primary key for ImageTB

e.g. FOREIGN KEY (Receipt, Passenger_Name) REFERENCES DetailsTB(Receipt, Passenger_Name), PRIMARY KEY (Receipt, Passenger_Name) for table ImageTB

I want to select record in both table but my query cant work properly

My query:

cmd = new SqlCommand("SELECT Picture FROM ImageTB WHERE DetailsTB.Passenger_Name = '" + datagridview_details.Rows[e.RowIndex].Cells[6].Value.ToString() + "' AND DetailsTB.Passenger_Name = ImageTB.Passenger_Name", con);

it gives me various sqlexception error.

So plz help me for the same query.

thanks in advance

Posted 11-Dec-13 20:51pm

er.shoaib

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thatraja 12-Dec-13 2:59am

What's the error message? Always include that in your question

er.shoaib 12-Dec-13 5:10am

It gives me error everytime
The multi-part identifier "DetailsTB.Passenger_Name" could not be bound.

creepz03 12-Dec-13 22:46pm

Base from what you posted, I don't think you even know what PRIMARY KEY and FOREIGN KEY means.. So I'd suggest you start by learning the basic of the SQLs,..

3 solutions

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Alexander Sharykin · Answer 1 · 2013-12-12T02:27:00

Solution 3

use JOIN in your query

C#

cmd = new SqlCommand(string.Format("SELECT Picture FROM ImageTB itb join DetailsTB dtb on dtb.Passenger_Name = itb.Passenger_Name WHERE dtb.Passenger_Name = '{0}'", datagridview_details.Rows[e.RowIndex].Cells[6].Value.ToString()), connection);

also you need check that atagridview_details.Rows[e.RowIndex].Cells[6].Value is not null
(or you will get NullReferenceException)

and also be aware of Sql injection

Posted 12-Dec-13 2:27am

Alexander Sharykin

Comments

BobJanova 12-Dec-13 12:24pm

Right. It should be a parameterised query though to avoid SQL injection as you say.

I would use a left join for this, as I would say it's more useful to get a row with a null for ImageTB.Picture rather than no results (which is what happens with an inner join).

DaveAuld · Answer 2 · 2013-12-11T21:02:00

Solution 1

I suggest you look at the use of JOINs.

Basic example: http://www.w3schools.com/sql/sql_join.asp[^]

Posted 11-Dec-13 21:02pm

DaveAuld

Rakesh Meel · Answer 3 · 2013-12-12T02:45:00

Solution 4

you have to understand about SQL Join to use multiple tables condition.

visit here to understand ...

SQL Retrieve data from multiple tables[^]

or

Use Join With Multiple Tables[^]

Posted 12-Dec-13 2:45am

Rakesh Meel

Updated 12-Dec-13 2:46am

v2