and y or en sentencia select

Erik Sacre Bases de Datos Ejemplo de And y Or Erik Sacre

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Erik SacreBases de Datos

Ejemplo de And y Or

Erik Sacre

Erik SacreBases de Datos

NULLNULLNULLNULL

NULLFALSENULLFALSE

FALSEFALSEFALSEFALSE

TRUENULLNULLTRUE

TRUEFALSEFALSETRUE

TRUETRUETRUETRUE

a OR ba AND bba

NULLNULL

TRUEFALSE

FALSETRUE

NOT aa

And, Or, Not

Erik SacreBases de Datos

Tabla para ejemploCREATE 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"

Erik SacreBases de Datos

Consultas ejemplo

select * from and_orwhere (a ='1' and b = '2') or c = '3'

"1";"2";"3""1";"2";"3"

select * from and_orwhere (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"

Erik SacreBases de Datos

Consultas ejemplo

select * from and_orwhere a ='1' or b = '5' and c = '6'

select * from and_orwhere (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"

Erik SacreBases de Datos

Consultas ejemplo

select * from and_orwhere (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"

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