Hello
everyones,
Did somebody know:
First:
What kind of expr it is
allowed on the check condition on: create table
syntax?
Second:
Is it posible to force
conditional FOREIGN KEY checks?
for example:
We make One table who have one UNIQUE Key and
one special condicion: TRUE or FALSE.
Then we create a second
table who refers one field to the FOREIGN key table
...
but we
got that there are 1 or 2 posible values for each row on the FOREIGN table: 'the
foreign key + true' and 'the foreing key + false' for each row, but we want
to allow just 2 posible values when the foreign key condition its set to TRUE,
and only 1 when its set to false.
And we want be
completly sure that just the correspondings values are entered on the second
table.
Example:
First table: Primary key field:
SKU+Special_Condition
SKU
Special_Condition Allow
A-1 FALSE JUST
one value with this SKU on the foreign table
B-1
TRUE
2 values with this SKU on the foreign table: 'B-1: FALSE' and 'B-1:
TRUE'
Second table: Foreign key field:
SKU+Special_Condition
SKU
Special_Condition Integrety_check
A-1
TRUE
Refuesed!: not valid value
A-1
FALSE Ok!
B-1
TRUE
Ok!
B-1
TRUE
Ok!
Why do I need
this?
1. I have a series
of rows who can take one or more values depending on a special condition who
much be specified first.
2. I need to
choose a specific field depending on the special condition
given,
3. I do not want to
allow to enter special conditions on the foreign table who are not
allowed the primary table, and
4. Later I'm going
to retrieve that specific value, based on the special condition
given
Example:
SKU
Special_Condition
Value1 Value2
A-1
FALSE
10 null
B-1
TRUE 20 30
C-1
TRUE
10
20
As you can
see:
- I would like
to retrieve from A-1 just Value1 because the special condition just allow
the first value
- I would like
to retrieve from B-1 or C-1 Value1 or Value2 because the special
condition allow both
values
Any
Idea?
A BETTER LIFE, starts with the best and more exclusive
products
for HEALTH, BEAUTY and HOME, the Sweet 16 by Quixtar.
Miguel Ernesto Pérez Cabrera
Independent Businnes Owner
IBO# 1066703
___________________________________________________________________
For more professional information, please go to:
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and contact me: at [EMAIL PROTECTED], or call me now
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choose the region or country closest to you, register like guest, and
post a comments about what was that who get more interesting to you.
for HEALTH, BEAUTY and HOME, the Sweet 16 by Quixtar.
Miguel Ernesto Pérez Cabrera
Independent Businnes Owner
IBO# 1066703
___________________________________________________________________
For more professional information, please go to:
Quixtar and Pronet
and contact me: at [EMAIL PROTECTED], or call me now
at (809) 530-3433.
If you have not visited yet, go to Pronet
choose the region or country closest to you, register like guest, and
post a comments about what was that who get more interesting to you.
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