Returns unique values from an IEnumerable. Uniqueness is determined using the default equality comparer.
int[] array = { 1, 2, 3, 4, 2, 5, 3, 1, 2 };
var distinct = array.Distinct();
// distinct = { 1, 2, 3, 4, 5 }
To compare a custom data type, we need to implement the IEquatable<T> i...
unique drops duplicates so that each element in the result is unique (only appears once):
x = c(2, 1, 1, 2, 1)
unique(x)
# 2 1
Values are returned in the order they first appeared.
duplicated tags each duplicated element:
duplicated(x)
# FALSE FALSE TRUE TRUE TRUE
anyDuplicated(x) >...
If you need to count distinct characters then, for the reasons explained in Remarks section, you can't simply use Length property because it's the length of the array of System.Char which are not characters but code-units (not Unicode code-points nor graphemes). If, for example, you simply write tex...
GROUP BY is used in combination with aggregation functions. Consider the following table:
orderIduserIdstoreNameorderValueorderDate143Store A2520-03-2016257Store B5022-03-2016343Store A3025-03-2016482Store C1026-03-2016521Store A4529-03-2016
The query below uses GROUP BY to perform aggregated calc...
When implementing SFINAE using std::enable_if, it is often useful to have access to helper templates that determines if a given type T matches a set of criteria.
To help us with that, the standard already provides two types analog to true and false which are std::true_type and std::false_type.
The...
SELECT DISTINCT ContinentCode
FROM Countries;
This query will return all DISTINCT (unique, different) values from ContinentCode column from Countries table
ContinentCodeOCEUASNAAF
SQLFiddle Demo
If you want to remove duplicates from a result, you can use .distinct():
Customers.select(:country).distinct
This queries the database as follows:
SELECT DISTINCT "customers"."country" FROM "customers"
.uniq() has the same effect. With Rails 5.0 it got deprecate...
The DISTINCT clause after SELECT eliminates duplicate rows from the result set.
CREATE TABLE `car`
( `car_id` INT UNSIGNED NOT NULL PRIMARY KEY,
`name` VARCHAR(20),
`price` DECIMAL(8,2)
);
INSERT INTO CAR (`car_id`, `name`, `price`) VALUES (1, 'Audi A1', '20000');
INSERT INTO CA...
Let
df = pd.DataFrame({'col_1':['A','B','A','B','C'], 'col_2':[3,4,3,5,6]})
df
# Output:
# col_1 col_2
# 0 A 3
# 1 B 4
# 2 A 3
# 3 B 5
# 4 C 6
To get the distinct values in col_1 you can use Series.unique()
df['col_1'].unique()
# Output:
...
Dim duplicateFruits = New List(Of String) From {"Grape", "Apple", "Grape", "Apple", "Grape"}
'At this point, duplicateFruits.Length = 5
Dim uniqueFruits = duplicateFruits.Distinct();
'Now, uniqueFruits.Count() = 2
'If iterated over at this poin...
An example of implementation which give a possibility to detect if user single or double tap on UITableViewCell.
override func viewDidLoad() {
viewDidLoad()
let doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap(sender:)))
double...
An example of implementation UITableView which allows to detect if cell has been tapped single or double time.
override func viewDidLoad() {
viewDidLoad()
let doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap(sender:)))
doubleTa...
