how to join two tables and filter the result using 2 dropdownlists

Question

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C#

string str = string.Format(@"select m.autoid,m.pcode, m.fyyear, m.date, m.salary, m.ta, m.contigency, m.nrc, m.institcharges, m.others,y.yearlyalloc,y.salary,y.ta,y.contigency,y.nrc,y.institcharges,y.others FROM monthly AS m inner join yearly y pcode where m.pcode=('" + DropDownList1.SelectedItem.ToString() + "' ) AND y.fyyear=('" + DropDownList2.SelectedItem.ToString() + "')", con);
       SqlDataAdapter da = new SqlDataAdapter(str, con);
       DataTable dt = new DataTable();
       da.Fill(dt);
       GridView1.DataSource = dt;
       GridView1.DataBind();

i am able to filter the data but i what i am not able to do is how to join two tables together and use them with dropdownlist condition

Posted 13-Mar-13 19:32pm

a2ulthakur

Updated 13-Mar-13 19:57pm

v3

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Comments

Prasanna Devarajan 14-Mar-13 2:09am

Can you be more specific, do you have problem in query formation ?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 2:11am

where m.pcode=('" + DropDownList1.SelectedItem.ToString() + "' )

Why there are brackets ?

a2ulthakur 14-Mar-13 2:12am

yes the problem is that when i am trying to execute it my sql data adapter is not filling up neither is the the data table so i think there must be something wrong with my query.

a2ulthakur 14-Mar-13 2:14am

@tadit i reused this query from another page of mine but in that page i was just populating data from one table only i wasn't using any join.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 2:21am

As you can see there are two answers saying that you have missed the join condition, which is specified by ON keyword.
So, try and let us know.

2 solutions

Solution 1

see the syntax of INNER JOIN

SQL

SELECT ft.col1, ft.col2, st.col1, st.col2
FROM FristTable ft
INNER JOIN SecondTable st
ON ft.colname = st.colname

in your query there is no ON keyword...

Posted 13-Mar-13 20:13pm

vishal.shimpi

Updated 13-Mar-13 20:19pm

v2

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lakshmilkk · Accepted Answer · 2013-03-13T20:14:00

Solution 2

correct the "inner join" query use "on" keyword to connect both tables
example:

SQL

select * FROM monthly AS m inner join yearly y on  m.pcode=y.pcode where m.pcode=('" + DropDownList1.SelectedItem.ToString() + "' ) AND y.fyyear=('" + DropDownList2.SelectedItem.ToString() + "'

Posted 13-Mar-13 20:14pm

lakshmilkk

Updated 13-Mar-13 20:20pm

v2

Comments

a2ulthakur 14-Mar-13 2:22am

string str = string.Format(@"select m.autoid,m.pcode, m.fyyear, m.date, m.salary, m.ta, m.contigency, m.nrc, m.institcharges, m.others,y.yearlyalloc,y.salary,y.ta,y.contigency,y.nrc,y.institcharges,y.others FROM monthly AS m inner join yearly y on pcode where m.pcode=('" + DropDownList1.SelectedItem.ToString() + "' ) AND y.fyyear=('" + DropDownList2.SelectedItem.ToString() + "')", con);

this is my corrected query its giving me following errors :
An expression of non-boolean type specified in a context where a condition is expected, near 'where'.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 2:30am

Again the ON condition is not correct.
It should contain something like below as suggested by @lakshmilkk.
on m.pcode=y.pcode

vishal.shimpi 14-Mar-13 2:33am

u cant write only 'ON pcode' becouse it requires boolean condition

a2ulthakur 14-Mar-13 2:39am

@tadit i have more problem i want my gridview this way
http://postimage.org/image/5hpr4k521/

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 3:36am

Can you tell me what is the problem, which you are facing, while designing this Grid ?

a2ulthakur 14-Mar-13 4:17am

the problem is i want headers row wise

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 4:30am

The headers are also inside one column ("Head"), right ?
So, try to make one column field named as "Head" and add the headers as rows to it.

I have not tried something like this. But if you will try and come back to me, then I will help you to modify and do it.

And yes, just click on "Reply" icon (right top side of this comment box) to reply to me. If you add a comment, I will not be notified.

a2ulthakur 14-Mar-13 4:42am

ok ill try what i was doing previously was that i was making a template field of heads column then i was adding labels and naming them what i wanted them to be .. but the thing is how to get the data to display like this ...do i do it the same way using labels

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Mar-13 5:06am

Try and let me know.