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And y Or en Sentencia Select
- 1. Ejemplo de And y Or Erik Sacre
- 2. And, Or, Not NULL NULL NULL NULL NULL FALSE NULL FALSE FALSE FALSE FALSE FALSE TRUE NULL NULL TRUE TRUE FALSE FALSE TRUE TRUE TRUE TRUE TRUE a OR b a AND b b a NULL NULL TRUE FALSE FALSE TRUE NOT a a
- 3. Tabla para ejemplo CREATE TABLE and_or ( a char(1), b char(1), c char(1) ) a b c ------------- "1";"2";"3" "4";"5";"6" "7";"8";"9" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6"
- 4. Consultas ejemplo select * from and_or where (a ='1' and b = '2') or c = '3' "1";"2";"3" "1";"2";"3" select * from and_or where (a ='4' and b = '6') and c = '3' Ninguno a b c ------------- "1";"2";"3" "4";"5";"6" "7";"8";"9" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6"
- 5. Consultas ejemplo select * from and_or where a ='1' or b = '5' and c = '6' select * from and_or where (a ='1' or b = '5') and c = '6' "4";"5";"6" "4";"5";"6" "4";"5";"6" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6" a b c ------------- "1";"2";"3" "4";"5";"6" "7";"8";"9" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6"
- 6. Consultas ejemplo select * from and_or where (a not like '1' or b like '5') and c like '6' a b c ------------- "1";"2";"3" "4";"5";"6" "7";"8";"9" "4";"5";"6" "1";"2";"3" "4";"5";"6" "4";"5";"6" "4";"5";"6" "4";"5";"6" "4";"5";"6" "4";"5";"6"