You have two options for concatenating strings in Oracle: CONCAT Using || CONCAT example: CONCAT( CONCAT( CONCAT( CONCAT( CONCAT(‘I like ‘, t.type_desc_column), ‘ cake with ‘), t.icing_desc_column), ‘ and a ‘), t.fruit_desc_column) Using || example: ‘I like ‘ || t.type_desc_column || ‘ cake with ‘ || t.icing_desc_column || ‘ and a ‘ || t.fruit_desc_column
It is about string concatenation performance. It’s potentially significant if your have dense logging statements. (Prior to SLF4J 1.7) But only two parameters are possible Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers (only) the majority of use cases. The API designers have … Read more
## is the preprocessor operator for concatenation. So if you use DEFINE_STAT(foo) anywhere in the code, it gets replaced with struct FThreadSafeStaticStat<FStat_foo> StatPtr_foo; before your code is compiled. Here is another example from a blog post of mine to explain this further. #include <stdio.h> #define decode(s,t,u,m,p,e,d) m ## s ## u ## t #define begin … Read more
const string message = “Hello” + “,world” + exclam; The + operator has left-to-right associativity, so the equivalent parenthesized expression is: const string message = ((“Hello” + “,world”) + exclam); As you can see, the two string literals “Hello” and “,world” are “added” first, hence the error. One of the first two strings being concatenated … Read more
If you want to modify the original array instead of returning a new array, use .push()… array1.push.apply(array1, array2); array1.push.apply(array1, array3); I used .apply to push the individual members of arrays 2 and 3 at once. or… array1.push.apply(array1, array2.concat(array3)); To deal with large arrays, you can do this in batches. for (var n = 0, to_add … Read more
more +2 file2.txt > temp type temp file1.txt > out.txt or you can use copy. See copy /? for more. copy /b temp+file1.txt out.txt
Use Variable Interpolation: @url: “@{root}@{file}”; Full code: @root: “../img/”; @file: “test.css”; @url: “@{root}@{file}”; .px{ background-image: url(@url); }
For your case the only difference is performance: append is twice as fast. Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit (Intel)] on win32 Type “help”, “copyright”, “credits” or “license” for more information. >>> import timeit >>> timeit.Timer(‘s.append(“something”)’, ‘s = []’).timeit() 0.20177424499999999 >>> timeit.Timer(‘s += [“something”]’, ‘s = []’).timeit() 0.41192320500000079 Python 2.5.1 … Read more
Try using || in place of + select locationname || ‘<p>’ from location; From SQLite documentation: The || operator is “concatenate” – it joins together the two strings of its operands.
You can use GROUP_CONCAT to perform that, e.g. something like SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list FROM sites s INNER JOIN publications p ON(s.id = p.site_id) GROUP BY p.id, p.name;