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How to DROP multiple columns with a single ALTER TABLE statement in SQL Server?
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create table test (a int, b int , c int, d int);
alter table test drop column b, d;
Be aware that DROP COLUMN does not physically remove the data, and for fixed length types (int, numeric, float, datetime, uniqueidentifier etc) the spac...
Delete topic in Kafka 0.8.1.1
I need to delete the topic test in Apache Kafka 0.8.1.1.
14 Answers
14
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What is the JavaScript convention for no operation?
...y turn off debug code in my program. In C/C++, I would have used macros. I tested assigning my fn to Function.prototype and timed it, comparing the results to simply having an if statement inside the function to return immediately. I also compared these to the results of simply removing the function...
What is a “batch”, and why is GO used?
...nd or set of commands over and over again. This may be to insert or update test data or it may be to put a load on your server for performance testing. Whatever the need the easiest way to do this is to setup a while loop and execute your code, but in SQL 2005 there is an even easier way to do this...
Using Regular Expressions to Extract a Value in Java
.../ create matcher for pattern p and given string
Matcher m = p.matcher("Testing123Testing");
// if an occurrence if a pattern was found in a given string...
if (m.find()) {
// ...then you can use group() methods.
System.out.println(m.group(0)); // whole matched expression...
How can I trigger a JavaScript event click
...n my page. I am trying to automate a number of clicks on the hyperlink for testing purposes. Is there any way you can simulate 50 clicks on the hyperlink using JavaScript?
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Reading 64bit Registry from a 32bit application
I have a c# unit test project that is compiled for AnyCPU. Our build server is a 64bit machine, and has a 64bit SQL Express instance installed.
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Is there a way to create a function from a string with javascript?
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I added a jsperf test for 4 different ways to create a function from string :
Using RegExp with Function class
var func = "function (a, b) { return a + b; }".parseFunction();
Using Function class with "return"
var func = new Function("re...
remove_if equivalent for std::map
...e_if(container, []( item_type& item ) {
return /* insert appropriate test */;
});
Second example (allows you to pass in a test value):
// 'test_value' is value that you might inject into your predicate.
// 'property' is just used to provide a stand-in test
using stuff::erase_if;
int test_va...
C++ SFINAE examples?
...pedef struct { char a[2]; } Two;
template<typename C> static One test(int C::*);
// Will be chosen if T is anything except a class.
template<typename C> static Two test(...);
public:
enum { Yes = sizeof(IsClassT<T>::test<T>(0)) == 1 };
enum { No = !Yes }...