select 2 tables of data when one table has some column values as empty


Need some help displaying data in my app is my problem..

if i have e.g. table A with 4 cols and 2 rows and values...col3 and col4 always start of empty..

Table A
              COL1, COL2, COL3, COL4
row1     val1,  val2,     empty, empty
row2     val1,  val2,     empty, empty

now when i have this data displayed on my datgrid i enter values into row1, col3 and col4 and then it gets saved to another table...

Table B
              COL1, COL2, COL3, COL4
row1     val1,    val2,   val3,    val4

now i need a SP that can bring me back my data that has been saved and the data still to be saved and display in my grid as...

row1     val1,    val2,   val3,    val4
row2     val1,    val2,   empty, empty

then once i then enter data into row2 and save again i want my SP to then display

row1     val1,    val2,   val3,    val4
row2     val1,    val2,   val3,    val4

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ste5anSenior DeveloperCommented:
What's your actual problem? What does "datagrid" refer to? Why don't you requery your data?
razza_bAuthor Commented:
My problem is i want a query to return the combined data of table A and table B to my datagrid....

 row1     val1,    val2,   val3,    val4
 row2     val1,    val2,   empty, empty
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
what's the unique identifier for ur first table and second table?

from my understanding, u probably can use a union clause to solve your problem.
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ste5anSenior DeveloperCommented:
It's a simple JOIN. But without keys it's hard to tell how the correct JOIN should look like.


SELECT A.col1, A.col2, B.col3, B.col4
FROM tableA A 
  LEFT JOIN tableB B ON B.col1=A.col1AND B.col2= A.col2;

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
1. in Table A:

              COL1, COL2, COL3, COL4
row1     val1,  val2,     empty, empty
row2     val1,  val2,     empty, empty

are these 2 rows exactly the same?

2. what about records in Table B?
Vitor MontalvãoMSSQL Senior EngineerCommented:
The rows with 'empty' values will stay in Table A forever?
Why not delete them after being inserted in Table B?

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