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How to check for Is not Null And Is not Empty string in SQL server?
...s UNKNOWN for these rather than TRUE.
CREATE TABLE T
(
C VARCHAR(10)
);
INSERT INTO T
VALUES ('A'),
(''),
(' '),
(NULL);
SELECT *
FROM T
WHERE C <> ''
Returns just the single row A. I.e. The rows with NULL or an empty strin...
How do you write a migration to rename an ActiveRecord model and its table in Rails?
...d to go and rename the model declaration file manually.
Edit:
In Rails 3.1 & 4, ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this:
class RenameOldTableToNewTable < ActiveRecord::Migration
def change
rename_table :old_table_name,...
How to pass variable number of arguments to a PHP function
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132
If you have your arguments in an array, you might be interested by the call_user_func_array fu...
Should I size a textarea with CSS width / height or HTML cols / rows attributes?
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12 Answers
12
Active
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What's the point of 'meta viewport user-scalable=no' in the Google Maps API
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110
On many devices (such as the iPhone), it prevents the user from using the browser's zoom. If ...
How to See the Contents of Windows library (*.lib)
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edited Mar 2 '16 at 1:16
Craig M. Brandenburg
2,35222 gold badges1919 silver badges3232 bronze badges
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How to search in array of object in mongodb
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371
The right way is:
db.users.find({awards: {$elemMatch: {award:'National Medal', year:1975}}})
...
How can I get the active screen dimensions?
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12 Answers
12
Active
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What's the difference between @Secured and @PreAuthorize in spring security 3?
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170
The real difference is that @PreAuthorize can work with Spring Expression Language (SpEL). You...