53 Relational Calculus  Tuple-oriented relational calculus เราสามารถนำ quantifiers มาใช้งานในสูตรได้ คือ Existential quantifiers  (there exists) Un
{"Image DocumentName": "Relational Calculus Tuple-oriented relational calculus", "Image ImageDescription": "\u0e40\u0e23\u0e32\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e19\u0e33 quantifiers \u0e21\u0e32\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19\u0e43\u0e19\u0e2a\u0e39\u0e15\u0e23\u0e44\u0e14\u0e49 \u0e04\u0e37\u0e2d. Existential quantifiers \uf024 (there exists) Universal quantifiers \uf022 (for all) \u0e43\u0e0a\u0e49\u0e42\u0e2d\u0e40\u0e1b\u0e2d\u0e40\u0e23\u0e40\u0e15\u0e2d\u0e23\u0e4c\u0e17\u0e32\u0e07\u0e15\u0e23\u0e23\u0e01\u0e30 \u0e40\u0e0a\u0e48\u0e19 \uf0d9 \uf0da ~ \u0e23\u0e48\u0e27\u0e21\u0e14\u0e49\u0e27\u0e22\u0e44\u0e14\u0e49", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}