I think what you are asking for will work by joining the Initial table to both Option_A and Option_B using LEFT JOIN, which will produce something like this: Initial LEFT JOIN Option_A LEFT JOIN NULL OR Initial LEFT JOIN NULL LEFT JOIN Option_B Example code: SELECT i.*, COALESCE(a.id, b.id) as Option_Id, COALESCE(a.name, b.name) as Option_Name … Read more
If your requirement was simply empty or null (like mine when I saw this title in a search result), you can use Dart’s safe navigation operator to make it a bit more terse: if (routeinfo[“no_route”]?.isEmpty ?? true) { // } Where isEmpty checks for an empty String, but if routeinfo is null you can’t call … Read more
If the first statement returns true, then the entire statement must be true therefore the second part is never executed. For example: $x = 5; true or $x++; echo $x; // 5 false or $x++; echo $x; // 6 Therefore, if your query is unsuccessful, it will evaluate the die() statement and end the script.
It’s the Ternary Operator. Basic usage is something like $foo = (if this expressions returns true) ? (assign this value to $foo) : (otherwise, assign this value to $foo) It can be used for more than assignment though, it looks like other examples are cropping up below. I think the reason you see this in … Read more
In the general case, you use 2 branches that go to past the if() body. If either one is taken, the if body doesn’t run. In assembly, you usually want to use the negation of the C condition, because you’re jumping past the loop body so it doesn’t run. Your later version does it backwards … Read more
Boolean expressions in most programming languages don’t follow the same grammar rules as English. You have to do separate comparisons with each string, and connect them with or: if x == “monkey” or x == “monkeys”: print “You’re right, they are awesome!!” else: print “I’m sorry, you’re incorrect.”, x[0].upper() + x[1:], “is not the right … Read more
Have to recomment the Exploring Expect book for all expect programmers — invaluable. I’ve rewritten your code: (untested) proc login {user pass} { expect “login:” send “$user\r” expect “password:” send “$pass\r” } set username spongebob set passwords {squarepants rhombuspants} set index 0 spawn telnet 192.168.40.100 login $username [lindex $passwords $index] expect { “login incorrect” { … Read more
You can’t do that with a LINQ joins – LINQ only supports equijoins. However, you can do this: var query = from e in entity.M_Employee from p in entity.M_Position where e.PostionId >= p.PositionId select p; Or a slightly alternative but equivalent approach: var query = entity.M_Employee .SelectMany(e => entity.M_Position .Where(p => e.PostionId >= p.PositionId));
Select SUM(CASE When CPayment=”Cash” Then CAmount Else 0 End ) as CashPaymentAmount, SUM(CASE When CPayment=”Check” Then CAmount Else 0 End ) as CheckPaymentAmount from TableOrderPayment Where ( CPayment=”Cash” Or CPayment=”Check” ) AND CDate<=SYSDATETIME() and CStatus=”Active”;