tema 5 sql Flashcards

1
Q

sql

A

structured query language . Estandar de IURE

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2
Q

sql fue desarrollado x..

A

donald chamberlain

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3
Q

cuantos comandos tiene?

A

7

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4
Q

en que dos grupos se dividen los comandos sql?

A

ddl y dml

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5
Q

comandos ddl de sql

A

data definition language

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6
Q

cuales son los comando ddl?

A

create drop alter

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7
Q

comando dml de sql definicion

A

data management language

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8
Q

cuales son los comandos dml

A

select insert update y delete

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9
Q

que son las clausulas en sql?

A

condiciones a cumplir para modificar algo

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10
Q

cuales son las clausulas en sql?

A

from where group by having order by

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11
Q

Que 3 tipos de operadores hay en sql?

A

logicos de comparacion y funciones de agregado

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12
Q

cita operadores logicos de sql

A

and or not

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13
Q

cita operadores de comparacion

A

< > between in

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14
Q

cita operadores de funciones de agregado

A

avg count(expre) sum max min SOLO se usan con select

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15
Q

inner join

A

combina registros siempre que tengan concordancia

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16
Q

union

A

se usa combinar tablas independientes

17
Q

constraint

A

se usa en instrucciones alter y create table para crear o eliminar indices

18
Q

pivot

A

muestra titulo columnas no opcionales

19
Q

comando truncate

A

borrar las filas (datos) pero mantiene toda la estructura (indices)