mos
>
> - Original Message -
> From: "Manuel Lemos" <[EMAIL PROTECTED]>
> To: "Noah Spitzer-Williams" <[EMAIL PROTECTED]>
> Sent: Saturday, June 23, 2001 1:54 PM
> Subject: Re: [PHP-DB] advantages/disads of primary keys and indices?
>
>
> > He
Hello Noah,
On 23-Jun-01 14:29:58, you wrote:
>Yeah the keys would be part of the first condition of the where clause...
>this table is like this:
>username | siteid | bannerid | clicks | someotherstat
>an update would be like: update tbl set clicks=clicks+1 where
>username='something' and si
Yeah the keys would be part of the first condition of the where clause...
this table is like this:
username | siteid | bannerid | clicks | someotherstat
an update would be like: update tbl set clicks=clicks+1 where
username='something' and siteid='something' and bannerid='something'
a select w
Hello Noah,
On 23-Jun-01 12:10:20, you wrote:
>I see,
>What about if you had 3 or 4 columns that would always be unique, is there
>an advantage to naming them as primary keys? does this slow inserts because
>it has to check if theres a duplicate entry?
What really slows down is updating the in
I see,
What about if you had 3 or 4 columns that would always be unique, is there
an advantage to naming them as primary keys? does this slow inserts because
it has to check if theres a duplicate entry?
""Manuel Lemos"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECT
With indices you speed SELECTs, but slow INSERTs and UPDATEs.
""Noah Spitzer-Williams"" <[EMAIL PROTECTED]> ha scritto nel messaggio
9h0n6v$l2h$[EMAIL PROTECTED]">news:9h0n6v$l2h$[EMAIL PROTECTED]...
> what are the advantages and disadvantages of primary keys and indices?
>
> - Noah
>
>
>
> --
>
Hello Noah,
On 22-Jun-01 21:17:35, you wrote:
>what are the advantages and disadvantages of primary keys and indices?
A primary key is a unique index.
Use indexes for the fields that will be most looked up in the first
condition of the WHERE clause of your SQL queries, especially if your
table
what are the advantages and disadvantages of primary keys and indices?
- Noah
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