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From:Andrés Tello Date:March 1 2012 12:40am
Subject:Re: Getting data from 2 tables if records have same date!
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what about

select customers.* from customers left join calls on
(customers.date=calls.date) where customers.date="02/28/12";

of course date should be an index in both tables.

I think it migth work

On Wed, Feb 29, 2012 at 4:54 PM, LUCi5R <luci5r@stripped> wrote:

> JW,
>
>
>
> I'm trying to understand LEFT JOIN as we go - but it's not working.
>
>
>
> This query
>
>
>
> SELECT *
>
> FROM CUSTOMERS
>
> LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE
>
> WHERE CUSTOMERS.DATE = "02/28/12" AND (CALLS.PHONE IS NULL OR CALLS.DATE =
> "02/28/12")
>
>
>
> Is giving me some results which I'm not quite sure what they are - but it's
> not the right results.
>
>
>
> The way I'm testing is, on 02/28/12 I had 57 Customers created in the
> CUSTOMERS table.
>
> I also had a total of 105 Calls recorded in the CALLS table. Some calls
> were
> from the same customers more then once.
>
>
>
> Essentially, I need the result to be 86 which I got from some manual
> calculations. Out of those 86 records, 1 record is in the CUSTOMERS table
> but not in the CALLS table. The other 85 were in both tables.
>
>
>
> The above LEFT JOIN query gave me 69 records and quite a few duplicate
> entries. I'm trying to dissect it to understand what exactly it selected.
>
>
>
> Thanks!
>
>
>
> ~~
> LUCi5R
> e:  luci5r@stripped
> w:  http://www.luci5r.com
>
>
>
>
>
> From: Johnny Withers [mailto:johnny@stripped]
> Sent: Wednesday, February 29, 2012 1:30 PM
> To: luci5r@stripped
> Cc: mysql@stripped
> Subject: Re: Getting data from 2 tables if records have same date!
>
>
>
> Sounds like you need to LEFT JOIN:
>
>
>
> SELECT *
>
> FROM CUSTOMERS
>
> LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE AND CALLS.DATE =
> "02/28/12"
>
> WHERE CUSTOMERS.DATE = "02/28/12"
>
>
>
> But that would only get customers created on 2/28 AND having a call on 2/28
> OR not call at all on 2/28.
>
>
>
> This would give you customers created on 2/28 with no calls AND customers
> created on 2/28 with a call on 2/28:
>
>
>
> SELECT *
>
> FROM CUSTOMERS
>
> LEFT JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE
>
> WHERE CUSTOMERS.DATE = "02/28/12" AND (CALLS.PHONE IS NULL OR CALLS.DATE =
> "02/28/12")
>
>
>
> JW
>
>
>
> On Wed, Feb 29, 2012 at 1:02 PM, LUCi5R <luci5r@stripped> wrote:
>
> Guys,
>
> I've been working with MySQL for a while (been on & off this list over the
> last 10 years or so); I'm definitely not a n00b and have worked with SQL
> extensively. Used JOIN and all quite a bit ... but I haven't done
> subqueries, union or nested joins.
>
> I'm completely stumped on this problem; and Google hasn't been helpful at
> all. I'll try to be as descriptive as possible.
>
> I have 2 tables ... CUSTOMERS and CALLS.
> Think of Customers table as your Directory. It has the customer's contact
> information & some other information. In total about 20 fields in there.
> The Calls table has only about 7 fields. Each time a customer calls in, the
> conversation details gets recorded in this Calls table.
>
> The PHONE field is the key field that joins the CUSTOMERS & CALLS tables.
> That is the only identifying key that gets written on the Calls record when
> that customer calls.
>
> One thing to note -- It is possible for a customer to exist in the
> CUSTOMERS
> table, but not exist in the CALLS table; however, it is not possible for a
> PHONE # to be in the CALLS table but not in CUSTOMERS table. Essentially, a
> customer's record has to be created first in the CUSTOMERS table before a
> call can be recorded from him in the CALLS table.
>
> Also, CALLS table can have multiple entries with same PHONE # (Customer
> called many times - maybe even same day), but CUSTOMERS will only have a
> single entry for a PHONE #.
>
> Here comes my problem ...
>
> I have a PHONE SEARCH box with the ability to define a date range; for
> simplicity sake - we'll use just One Date instead of "DATE ... BETWEEN" for
> now.
>
> When someone searches for a PHONE number, I want to show ALL the CUSTOMERS
> that:
> a. Were CREATED on that day (Date defined in Search Criteria)
> b. Had CALLED in that day (Date defined in Search Criteria)
>
> The DATA that I need to pull up and show is in the CUSTOMERS table; not the
> CALLS table -- so the DATA I need needs to come out of the CUSTOMERS table
> matching on phone from both tables for the given DATE.
>
> In other words - any CUSTOMER that has the PHONE NUMBER which appears  in
> BOTH CUSTOMERS & CALLS table with the DATE defined should pull up.
>
> For the life of me - I can't get this to work!!
> Let's take the date "02/28/12" for example sake.
>
> My biggest issue is ... using JOIN, I can pull up ...
> a. ALL the phone/customers that appeared in the CALLS table with date
> "02/28/12"
> b. ALL the phone/customers that appeared in CALLS & CUSTOMERS with date
> "02/28/12"
>
> BUT -- If there's a customer with date "02/28/12" who DOES NOT appear in
> CALLS table at all - does NOT show up!! And that is because I'm using
> CUSTOMERS.PHONE=CALLS.PHONE in the JOIN ON clause. So it obviously won't
> pick up a record where the phone didn't exist in both tables.
>
> My initial query was:
>
> SELECT * FROM CUSTOMERS JOIN CALLS ON CUSTOMERS.PHONE = CALLS.PHONE
> WHERE CUSTOMERS.DATE = "02/28/12" AND CALLS.DATE = "02/28/12"
>
> I've tried 100's of combinations of this query; many different OR, AND,
> GROUP BY combinations --- but I can't pull up ALL records from CUSTOMERS
> with DATE "02/28/12" and ALL records from CALLS with DATE "02/28/12" in a
> single query.
>
> I've hit a wall here.
>
> Any ideas/suggestions/advice?
>
> THANKS
>
> ~~
> LUCi5R
> e:  luci5r@stripped
> w:  http://www.luci5r.com
>
>
>
> --
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>
>
>
>
>
>
>
> --
> -----------------------------
> Johnny Withers
> 601.209.4985
> johnny@stripped
>
>

Thread
Getting data from 2 tables if records have same date!LUCi5R29 Feb
  • Re: Getting data from 2 tables if records have same date!Johnny Withers29 Feb
    • RE: Getting data from 2 tables if records have same date!LUCi5R29 Feb
      • Re: Getting data from 2 tables if records have same date!Johnny Withers29 Feb
        • RE: Getting data from 2 tables if records have same date!LUCi5R1 Mar
      • Re: Getting data from 2 tables if records have same date!Andrés Tello1 Mar
      • Re: Getting data from 2 tables if records have same date!Shawn L Green1 Mar
        • Re: Getting data from 2 tables if records have same date!David Giragosian1 Mar
        • RE: Getting data from 2 tables if records have same date!LUCi5R1 Mar
          • Re: Getting data from 2 tables if records have same date!Shawn L Green1 Mar
    • Re: Getting data from 2 tables if records have same date!hsv1 Mar
      • RE: Getting data from 2 tables if records have same date!LUCi5R1 Mar