Question

I need some help on how to proceed with this problem :

I have the following SQL Server tables :

Transitions

---

ID int,
VariableID int,
To_VariableID int,
To_ValueID int,
To_CommentInput bit,
To_SP varchar(255)

---

Processes

---

ID int,
VariableID int,
ValueID int,
Manual_Value varchar(255)

---

What applies for Transitions: Only one field among

To_VariableID, To_ValueID, To_CommentInput, To_SP

can be set at a time in each row.

In some cases I want certain data from Transitions to go to Processes.

Now, if To_ValueID has been set in a row in Transitions, its value should go to the ValueID field in the Processes table.
If not, then the field that is filled ( don’t know which one, it could be To_VariableID, To_CommentInput, To_SP ) should go in the Manual_Value field.

Any help would be greatly appreciated!

Answer 1

Something like this, although your exact mapping may differ.

Insert Into Processes (Id, VariableID, ValueID, Manual_Value)
Select
  Id,
  VariableID,
  To_ValueID,
  Coalesce(To_VariableID, To_CommentInput, To_SP)
From
  Transistions