Forgive me if this question has already been asked, but... I'm trying to select data from 2 different tables in a database and count all the data in one table that is equal to the data in the second table if that makes sense? Below is the code I am trying to use
$select = "SELECT * FROM client_id, clientid, COUNT(client_id) FROM enquiry, check_s WHERE client_id = clientid";
Your query appears to be syntactically wrong.
What you can try is to join the two tables on a primary key(id?) and any other fields you're trying to match. The basic syntax would be like this:
SELECT * FROM
DB1.Table1
JOIN DB2.Table2
ON DB1.Table1.PrimaryKey = DB2.Table2.PrimaryKey;
If you're looking for an exact data match, you may have to join the tables based on all fields(in the ON clause in the above query).
Edit:
Now that you've explained it, you can try this:
SELECT table1.*, count(*) as `n` FROM table1
JOIN table2
ON table1.field = table2.field;
Again, if you need to compare more fields, just include them in the ON clause, and set conditions in the WHERE clause.
I think you might be looking for something like this:
Lets say your main table name is Client and your secondary table (from the form) is Enquiry and the column which you want to compare in client is called client_id and the same column in Enquiry is called clientid.
Then you have
Select Count(Client.*)
From Client, Enquiry
Where Client.client_id = Enquiry.clientid
Group by Client.client_id
Related
SELECT
c.ConfigurationID AS RealflowID, c.companyname,
c.companyphone, c.ContactEmail, COUNT(k.caseid)
FROM
dbo.Configuration c
INNER JOIN
dbo.cases k ON k.SiteID = c.ConfigurationId
WHERE
EXISTS (SELECT * FROM dbo.RepairEstimates
WHERE caseid = k.caseid)
AND c.AccountStatus = 'Active'
AND c.domainid = 46
GROUP BY
c.configurationid,c.companyname, c.companyphone, c.ContactEmail
I have this query - I am using the configuration table to get the siteid of the cases in the cases table. And if the case exists in the repair estimates table pull the company details listed and get a count of how many cases are in the repair estimator table for that siteid.
I hope that is clear enough of a description.
But the issue here is the count is not correct with the data that is being pulled. Is there something I could do differently? Different join? Remove the exists add another join? I am not sure I have tried many different things.
Realized I was using the wrong table. The query was correct.
I just hit a wall with my SQL query fetching data from my MS SQL Server.
To simplify, say i have one table for sales, and one table for customers. They each have a corresponding userId which i can use to join the tables.
I wish to first SELECT from the sales table where say price is equal to 10, and then join it on the userId, in order to get access to the name and address etc. from the customer table.
In which order should i structure the query? Do i need some sort of subquery or what do i do?
I have tried something like this
SELECT *
FROM Sales
WHERE price = 10
INNER JOIN Customers
ON Sales.userId = Customers.userId;
Needless to say this is very simplified and not my database schema, yet it explains my problem simply.
Any suggestions ? I am at a loss here.
A SELECT has a certain order of its components
In the simple form this is:
What do I select: column list
From where: table name and joined tables
Are there filters: WHERE
How to sort: ORDER BY
So: most likely it was enough to change your statement to
SELECT *
FROM Sales
INNER JOIN Customers ON Sales.userId = Customers.userId
WHERE price = 10;
The WHERE clause must follow the joins:
SELECT * FROM Sales
INNER JOIN Customers
ON Sales.userId = Customers.userId
WHERE price = 10
This is simply the way SQL syntax works. You seem to be trying to put the clauses in the order that you think they should be applied, but SQL is a declarative languages, not a procedural one - you are defining what you want to occur, not how it will be done.
You could also write the same thing like this:
SELECT * FROM (
SELECT * FROM Sales WHERE price = 10
) AS filteredSales
INNER JOIN Customers
ON filteredSales.userId = Customers.userId
This may seem like it indicates a different order for the operations to occur, but it is logically identical to the first query, and in either case, the database engine may determine to do the join and filtering operations in either order, as long as the result is identical.
Sounds fine to me, did you run the query and check?
SELECT s.*, c.*
FROM Sales s
INNER JOIN Customers c
ON s.userId = c.userId;
WHERE s.price = 10
I am trying to deduplicate a large table where values are present but broken into several rows.
For example:
Table 1: Client_Code,Account#, First and last names, address.
Table 2: Client_Code,Account#, First and last names, address, TAX_ID.
Now what I want to do may seem pretty obvious at this point.
I want my results to pull from Table 1 into a new table and the query to be "Select From Table 1 where client code and account# from table 1 match client code and account# from table 2." TAble 2 has all values populated, Table 1 has everyone except TAX ID.
The code i tried looked like this.
CREATE TABLE Dedupe_1 AS SELECT * FROM `TABLE 1`
WHERE `TABLE 1`.`Client_Code`=`TABLE 2`.`Client_Code`
AND
WHERE `TABLE 1`.`account#`=`TABLE 2`.`account#`
ORDER BY `TABLE 2`.`account#`
I keep getting a syntax error. I am very new to this programming language so I apologize if this question is hard to understand.
I was just under the impression that I could call to a field from another table by simply using the 'WHERE' statement.
I think you want to use an exists clause:
CREATE TABLE Dedupe_1 AS
SELECT *
FROM `TABLE 1` t1
WHERE EXISTS (select 1
from table2 t2
where t2.Client_Code = t1.Client_Code and t2.`account#` = t1.`account#`
);
You may want to use Join to connect two tables. You can make use of common column among two tables for Join statement. Common syntax goes like
SELECT table1.column1, table2.column 2 and as many you want in common table
FROM table1 name
INNER JOIN table2 name
ON table1.commoncolumn=table2.Common column;
You may learn more about joins here.
I have 2 tables in a MYSQL database wich look like this:
Klant:
ID Naam Email Soort Status
6 test test test2
7 status test test test 20
8 soort test test test
9 soort test 2 test2 Museum
Mail:
ID Content Datum Titel
1 (lots of encoded HTML) 18-03-13 test
2 (lots of encoded HTML) 18-03-13 test2
4 (lots of encoded HTML) 18-03-13 alles weer testen
(yes, I'm still testing alot^^)
Now I have a SQL query that selects all from 'Klant' with a where clause which gets the ID from a previous page:
$strSQL = "SELECT * FROM Klant WHERE ID = '".$_GET["ID"]."' ";
What I want is to JOIN this query with the following query:
SELECT ID, Titel FROM Mail;
EDIT:
From all your answers and comments I think I begin to think my question maybe is totally wrong.. I'll explain where I need it for and I might not even need JOIN? I currently have a table wich includes the data from 'Klant' which looks like this:
The meaning is that I add another table which includes all the ID's and Title's from 'Mail'. I am sorry for the confusion I may have caused with you since I wasn't that clear with my question. I hope that this may clear up what I want and you guys can maybe tell me if I even need to JOIN this or can I do something else?
I am still a student and this is the first time I've had to use JOIN and I can't figure this out. If anyone can show me how to do this or push me in the right direction it would be great!
SELECT * FROM Klant t1
JOIN
SELECT ID, Titel FROM Mail t2
ON t1.ID = t2.ID
WHERE t1.Name = 'test'
To have the desired result do the following:
SELECT * FROM Klant t1
JOIN
SELECT ID, Titel FROM Mail t2
ON t1.ID = t2.ID
And if you want to have a specific row than just add the where clause:
WHERE t1.ID = 6
or
WHERE t1.Naam = 'test'
and so on
It is difficult to see how a JOIN is applicable in the example in your question.
A JOIN let's you pull information from more than one table based on a relationship. As far as I can see, your table's don't have any way to link a row in one with a row in the other, unless SteveP is correct and your id's provide that relationship.
For example, if your klant table had a mail_id column then you could do
SELECT *
FROM klant
JOIN mail ON klant.mail_id = mail.id
and this would return a row for every matching pair of rows in the two tables. Alternatively you could use a LEFT OUTER JOIN to pull back all rows from the table on the left of the JOIN and optionally data from a matching row on the right.
If there is nothing joining the table, you can use a CROSS JOIN which will return you a full cartesian of each row in table1 with every row in table2.
Something people often confuse with a JOIN is a UNION which allows you to write 2 SELECT statements and return the result set of both combined/joined together, but these should return the same columns in each query (e.g. selecting NULL in place of the column in a query if the query doesn't pull data for that column)
I'm guess that you want to join on the ID field which is common between the tables.
select * from Klant, Mail where Klant.ID = '".$_GET["ID"]."' and Klant.ID = Mail.ID
You can also do
select * from Klant
join Mail on Mail.ID = Klant.ID
where Klant.ID = '".$_GET["ID"]."'
You can do this directly by using the following query :
select k.ID,k.Naam, k.Email,k.Soort,k.Status, m.ID,m.Titel from Klant k, Mail m where k.ID = m.ID and k.ID = '".$_GET["ID"]."'
I have a table in my database that has 1.1MM records. I have another table in my database that has about 2000 records under the field name, "NAME". What I want to do is do a search from Table 1 using the smaller table and pull the records where they match the smaller tables record. For example Table 1 has First Name, Last Name. Table 2 has Name, I want to find every record in Table 1 that contains any of Table 2 Names in either the first name field or the second name field. I tried just making an access query but my computer just froze. Any thoughts would be appreaciated.
have you considered the following:
Select Table1.FirstName, Table1.LastName
from Table1
where EXISTS(Select * from Table2 WHERE Name = Table1.FirstName)
or EXISTS(Select * from Table2 WHERE Name = Table1.LastName)
I have found before that on large tables this might work better than an inner join.
Be sure to create indexes on Table1.first_name, Table1.last_name, and Table2.name. They will dramatically speed up your query.
Edit: For Microsoft Access 2007, see CREATE INDEX.
See above previous notes about indexes, but I believe from your description, you want something like:
select table1.* from table1
inner join
table2 on (table1.first_name = table2.name OR table1.last_name = table2.name);
It should go something like this,
Select Table1.FirstName, Table1.LastName
from Table1
where Table1.FirstName IN (Select Distinct Name from Table2)
or Table1.LastName IN (Select Distinct Name from Table2)
And there are various other ways to run this same query, i would suggest you see execution plan for each of these queries to find out which one is the fastest. In addition creating indexes on the column which is used in a "where" condition will also speed up the query.
i agree with astander. based on my experience, using EXIST instead of IN is a lot faster.