Select a column with a keyword name
use backtick to escape keyword instead. just like how you created your table. using double quote or single quote will parse it into string that is why you’re getting two records of and select `AND` from test;
keyword
Using keywords as identifiers in F#
Given section 3.4 of the F# 2.0 spec: Identifiers follow the specification below. Any sequence of characters that is enclosed in double-backtick marks (“ “), excluding newlines, tabs, and double-backtick pairs themselves, is treated as an identifier. I suspect you can put it in backticks: “private“ I haven’t tried it though.
What is the equivalent of the C# ‘var’ keyword in Java?
There is none. Alas, you have to type out the full type name. Edit: 7 years after being posted, type inference for local variables (with var) was added in Java 10. Edit: 6 years after being posted, to collect some of the comments from below: The reason C# has the var keyword is because it’s … Read more
Groovy: what’s the purpose of “def” in “def x = 0”?
It’s syntactic sugar for basic scripts. Omitting the “def” keyword puts the variable in the bindings for the current script and groovy treats it (mostly) like a globally scoped variable: x = 1 assert x == 1 assert this.binding.getVariable(“x”) == 1 Using the def keyword instead does not put the variable in the scripts bindings: … Read more
Gson Java reserved keyword
You could use a different name for your field, using gson’s Field Naming Support. public class Post { @SerializedName(“public”) private boolean isPublic; … }
VB.NET equivalent to C# var keyword [duplicate]
Option Infer must be on in order for this to function properly. If so, then omitting the type in VB.NET (Visual Basic 9) will implicitly type the variable. This is not the same as “Option Strict Off” in previous versions of VB.NET, as the variable is strongly-typed; it’s just done so implicitly (like the C# … Read more
What are Virtual Methods?
The Virtual Modifier is used to mark that a method\property(ect) can be modified in a derived class by using the override modifier. Example: class A { public virtual void Foo() //DoStuff For A } class B : A { public override void Foo() //DoStuff For B //now call the base to do the stuff for … Read more
“new” keyword in Scala
Use the new keyword when you want to refer to a class‘s own constructor: class Foo { } val f = new Foo Omit new if you are referring to the companion object’s apply method: class Foo { } object Foo { def apply() = new Foo } // Both of these are legal val … Read more
When to use static keyword before global variables?
You should not define global variables in header files. You should define them in .c source file. If global variable is to be visible within only one .c file, you should declare it static. If global variable is to be used across multiple .c files, you should not declare it static. Instead you should declare … Read more
How to use “raise” keyword in Python [duplicate]
It has two purposes. jackcogdill has given the first one: It’s used for raising your own errors. if something: raise Exception(‘My error!’) The second is to reraise the current exception in an exception handler, so that it can be handled further up the call stack. try: generate_exception() except SomeException as e: if not can_handle(e): raise … Read more