Data Types
•Download as PPTX, PDF•
0 likes•55 views
The document discusses different data types including numbers, strings, Booleans, and structures like arrays, lists, trees, graphs, hashes, sets, and JSON. It provides details on numeric types like integers and floats. String types include char, varchar, and text. Structures allow storing and organizing data and include arrays, lists, trees, graphs, hashes, sets and JSON. The document also briefly discusses typing in programming languages.
Report
Share
Data Types
- 1. DATA TYPES Masters Academy, 2018
- 3. Types - Number - Integer - Float - Number - String - Char - Character varying - Text - Boolean
- 4. Types integer Tiny integer tinyint, byte 0..255 8 bit Small Integer smallint -32768 +32767 16 bit integer smallint -2147483648 +2147483647 32 bit Big integer bigint -9223372036854775808 +9223372036854775807 64 bit
- 5. Types float Float float 1.175494351 E -38 3.402823466 E +38 6 - 7 32 bit Double double 2.2250738585072014 E -308 1.7976931348623158 E +308 15 - 16 64 bit
- 6. Types string Char a, b, 1, 3, - , +, ], ... Varchar abc, bcd, 123, ... Text abc, bcd, 123, ... } 4 Gb
- 7. Types Boolean TRUE, FALSE 0 1 YES NO PRESENT ABSENT }1 Bit
- 8. Structures - Variable - Pointer - Array - List - Tree - Graph - Hash - Set - JSON
- 9. Structures Variable a = 1 a1 = 5 AA = ‘ab’
- 10. Structures Variable - Starts with a-zA-Z - Contains only a-zA-Z0-9_ - No spaces or special characters - Cannot be same as keyword
- 12. Structures Array [1, 2, 120, 150, 11, 13] [‘ab’, ‘cd’, ‘ef’] [1, ‘a’, 2, ‘bca’, 123, ‘z’]
- 13. Structures Array 1 ab 12 31 cde 131 frt 0 1 2 3 4 5 6
- 14. Structures Array 1 ab 12 31 cde 131 frt -7 -6 -5 -4 -3 -2 -1
- 15. Structures Array arr = [1, ‘ab’, 12, 31, ‘cde’, 131, ‘frt’] arr[0] => 1 arr[2] => ‘ab’ arr[-1] => ‘frt’ arr[-3] => ‘cde’
- 16. Structures Array String str = ‘we are masters’ W E A R E M A S T E R S
- 17. Structures Array String str = ‘we are masters’ W E A R E M A S T E R S W E A R E M A S T E R S
- 18. Structures Array String str1 = ‘we’ str2 = ‘are’ str3 = ‘masters’ str1 + str2 + str3 = ‘wearemasters’ str1 - str2 = ‘w’ str1 & str2 = ‘e’
- 19. Structures Array str1 = [‘w’, ’e’] str2 = [‘a’, ’r’, ’e’] str3 = [‘m’,’a’,’s’,’t’,’e’,’r’,’s’] str1 + str2 + str3 = [‘w’,’e’,’a’,’r’,’e’,’m’,’a’,’s’,’t’,’e’,’r’,’s’] str1 - str2 = [‘w’] str1 & str2 = [‘e’]
- 21. Structures Tree
- 23. Structures Tree 1 2 4 5 3 6 7 true false
- 24. Structures Tree 1 2 4 5 3 6 7 true false
- 32. Structures Graph 1 2 4 5 3 6 7 1 10 3 4
- 33. Structures Hash (Associated Array)
- 34. Structures Hash h = { ‘a’ => 1, ‘b’ => 2 } h = { ‘a’: 1, ‘b’: 2 } h = { a: 1, b: 2 } h[‘a’] => 1 h[‘a’] => 1 h[‘a’] => 1 h[:a] => 1
- 35. Structures Hash h = { a: 1, b: 2 } value = hash(key) key value 1 = hash(‘a’) 2 = hash(‘b’)
- 36. Structures Hash h = { a: 1, b: 2 } h = { a: ‘1’, b: 2 } h = { a: ‘1’, b: [2] } h = { a: ‘1’, b: { c: 2 } }
- 37. Structures Set set = { 1, 2, 3, 4, 5, 6, 6, 1 } set = { 1, ‘2’, 3, ‘4’, [5], 6, 6, 1 } set = { {1} ,{’2’} ,{3}, {‘4’}, { [5] }, { 6, 6, 1 } } set = { {1} ,’2’ ,{3}, {‘4’}, [5], { 6, 6, 1 } }
- 38. Structures Set set1 = { 1, 2, 3 } set2 = { 2, 3, 4, 5 } set1 set2 => { 1 } set1 | set2 => { 1, 2, 3, 4, 5 } set1 △ set2 => { 1, 4, 5 }
- 39. Structures JSON { “a”: 1, “b”: “2”, “c”: [3], “d”: [“4”], “e”: { “f”: 5, “g”: [“6”] } }
- 40. Structures JSON { “a”: 1, “b”: “2”, “c”: [3], “d”: [“4”], “e”: { “f”: 5, “g”: [“6”] } } “{“a”:1,“b”:“2”,“c”:[3],“d”:[“4”],“e”:{“f”:5,“g”:[“6”]}}”
- 41. Typing integer → float float → integer float → string string →
- 42. Typing - Dynamic - Static - Strong - Weak
- 44. Typing 10 000 users longest name ~ up to 50 symbols
- 45. Typing 10 000 users longest name ~ up to 50 symbols longest uk name ~ up to 15 symbols
- 46. Typing one name = 50 symbols = 50 bytes one name = 50 symbols = 52 bytes x 10 000 users = 520 000 bytes ~= 51 kB
- 47. Typing one name = 15 symbols = 15 bytes one name = 15 symbols = 16 bytes x 10 000 users = 160 000 bytes ~= 15 kB
- 48. Typing Q & A