Mark Forums Read

check constraint on other column

Go Back

comp.databases.postgresql comp.databases.postgresql

Reply

Page 1 of 2

1

#1

Old

Generale Cluster

Posts: n/a

check constraint on other column - 09-08-2008 , 11:22 AM

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

Thank you
Regards

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#2

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#3

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#4

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#5

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#6

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#7

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#8

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#9

Old

Generale Cluster

Posts: n/a

Re: check constraint on other column - 09-08-2008 , 11:28 AM

Generale Cluster ha scritto:

Quote:

Hello,
is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

Thank you

--
elimina unsampdoriano per rispondere via email

Reply With Quote

#10

Old

Laurenz Albe

Posts: n/a

Re: check constraint on other column - 09-09-2008 , 01:21 AM

Generale Cluster <alexunsampdoriano (AT) unsampdorianosoftmasters (DOT) net> wrote:

Quote:

is it possible to define a check with the following rules, without using
a trigger?

When inserting a value in field1:
- if field2=true then field1 must be 0
- if field2=false then field1 may be any number

I've thought about this:
CHECK ((field2=true AND field1=0) OR (field2=false AND field1>0))

is it right?

According to your requirements, I would rather expect

CHECK ((field2=true AND field1=0) OR (field2=false))

Yours,
Laurenz Albe

Reply With Quote

Reply

Page 1 of 2

1

« Previous Thread | Next Thread »

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off

Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.