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Notes
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Arrays VS Sets 
const taskArrays = ['code', 'Eat', 'code'];
console.log(taskArrays);
//["code", "Eat", "code"]
Use when you need 
ordered
list of values (might contains duplicates) Use when you need to 
manipulate
data 
const taskSets = new Set(['code', 'Eat', 'code']);
console.log(taskSets);
//{"code", "Eat"}
Use when you need to work with 
unique
values Use when 
High-performance
is really important Use to 
remove
duplicates from arrays
by გიორგი ბაკაშვილი
4 years ago
0
0
TRUNCATE
Deletes all the rows from 
notes
table
TRUNCATE notes;
The same as the query above - deletes all rows
TRUNCATE TABLE notes;
Note: The two queries are aliases for each other
by Valeri Tandilashvili
4 years ago
0
MySQL
TRUNCATE
1
DROP TABLE
Deletes the table 
notes
with its content
DROP TABLE notes;
If the table does not exist, it will generate the following error:
#1051 - Unknown table 'notes
Deletes several tables at the same time
DROP TABLE notes, students;
Deletes the table if exists, otherwise it will not generate an error
DROP TABLE IF EXISTS notes;
Note: There is no undo. Once we delete, the table is gone
by Valeri Tandilashvili
4 years ago
0
MySQL
DROP
Full MySQL Course for Beginners
1
CONV
Converts the first argument from one number system (the second argument) to another (the third argument) Converts 
5
from 
10
base system to 
2
SELECT
    CONV(5, 10, 2)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
POWER
Raises the first argument to the power of another argument. The code below returns 
16
because 
2
to the power of 
4
is 
16
SELECT 
    POWER(2, 4)
Note: 
POW
and 
POWER
are the aliases for the same command
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
RADIANS / DEGREES
These two functions are opposite to each other. 
180
degrees converted to radians gives us 
PI
: 
3.141592653589793
PI
: 
3.141592653589793
radians converted to degrees gives us 
180
degrees.
SELECT
    RADIANS(180),
    DEGREES(3.141592653589793)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
DEGREES
Converts radians back to degrees. Half of 
PI
radians 
1.5707963267948966
converted to degrees gives us 
90
degrees. 
PI
: 
3.141592653589793
radians converted to degrees gives us 
180
degrees.
SELECT
    DEGREES(1.5707963267948966),
    DEGREES(3.141592653589793)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
0
RADIANS
Converts degrees to radians. 
90
degrees converted to radians gives us half of 
PI
: 
1.5707963267948966
. 
180
degrees converted to radians gives us 
PI
: 
3.141592653589793
.
SELECT
    RADIANS(90),
    RADIANS(180)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
CEIL
Rounds the number up to the lowest integer value greater than the passed decimal argument. Both of the arguments will be rounded to 
3
SELECT
    CEIL(2.3),
    CEIL(2.8)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
FLOOR
Rounds the argument down to the greater integer less then the decimal argument. Both of the arguments will be rounded down to 
2
SELECT
    FLOOR(2.3),
    FLOOR(2.8)
by Valeri Tandilashvili
4 years ago
0
MySQL
Mathematical functions
Full MySQL Course for Beginners
1
Results: 1578