I have the following database scheme on MySQL and I would like to retrieve all elements for a speciic id.
So for instance, I would like to retrieve cities, categories, departments linked to the coupon_id=1 (and other fields).
I wrote the following SQL query but unfortunatelly could not get the desired result.
SELECT cc_coupon.id_coupon as idCoupon,
cc_coupon.condition_coupon,
cc_coupon.description,
cc_coupon.type_coupon,
cc_coupon_by_categorie.id_categorie,
cc_categorie.categorie as category,
cc_annonceur.raison_sociale,
cc_coupon_active_in_cities.id_ville as ville_slug,
cc_villes_france.ville_slug,
cc_villes_france.ville_nom_departement,
cc_villes_france.ville_departement
FROM cc_coupon,
cc_coupon_by_categorie,
cc_categorie,
cc_annonceur,
cc_coupon_active_in_cities,
cc_coupon_active_in_departments,
cc_villes_france
WHERE cc_coupon.id_coupon = cc_coupon_by_categorie.id_coupon
and cc_categorie.id_categorie = cc_coupon_by_categorie.id_categorie
and cc_coupon.id_annonceur = cc_annonceur.id_annonceur
and cc_coupon.id_coupon = cc_coupon_active_in_cities.id_coupon
and cc_villes_france.id_ville = cc_coupon_active_in_cities.id_ville
and cc_villes_france.ville_departement = cc_coupon_active_in_departments.ville_departement
and cc_coupon.id_coupon = 1
and cc_coupon_active_in_cities.id_coupon = 1
and cc_coupon_active_in_departments.id_coupon = 1
Thanks for your help.
I think you should use the on and not where when you want to join two tables. When you want to specify other conditions use where clause.
Related
i am having troubles understanding how to access columns from a subquery (MySQL). Here is my code:
Personne personne = Personne.PERSONNE.as("personne");
Evenement evenement = Evenement.EVENEMENT.as("evenement");
Genealogie genealogie = Genealogie.GENEALOGIE.as("genealogie");
Lieu lieu = Lieu.LIEU.as("lieu");
SelectField<?>[] select = { DSL.countDistinct(personne.ID).as("countRs"), lieu.LIBELLE.as("libelleRs"),
lieu.ID.as("idVille") };
Table<?> fromPersonne = evenement.innerJoin(personne).on(personne.ID.eq(evenement.IDPERS))
.innerJoin(genealogie).on(genealogie.ID.eq(personne.IDGEN)).innerJoin(lieu)
.on(lieu.ID.eq(evenement.IDLIEU));
Table<?> fromFamille = evenement.innerJoin(personne).on(personne.IDFAM.eq(evenement.IDFAM))
.innerJoin(genealogie).on(genealogie.ID.eq(personne.IDGEN)).innerJoin(lieu)
.on(lieu.ID.eq(evenement.IDLIEU));
GroupField[] groupBy = { lieu.ID };
Condition condition = //conditionally build, not relevant i think
result = create.select(DSL.asterisk())
.from(create.select(select).from(fromPersonne).where(condition).groupBy(groupBy)
.union(create.select(select).from(fromFamille).where(condition).groupBy(groupBy)))
// i would like something like this but i don't know how: .groupBy(groupBy).fetch();
Basicly what i have is:
SELECT
*
FROM(
(SELECT
countRs, libelleRs, idVille
FROM
fromPersonne
WHERE
-- conditions
GROUP BY lieu.ID)
UNION
(SELECT
countRs, libelleRs, idVille
FROM
fromFamille
WHERE
-- conditions
GROUP BY lieu.ID)
)GROUP BY lieu.ID -- this is where i need help
In a plain MySQL query i would just give an alias to the union and then make a reference to the column i want to group by using the alias but it seems like it does not work like this with JOOQ.
I just need to group the results of the subqueries together but i don't know how to make a reference to the subqueries columns... I am sure i would have to reference my subqueries in objects outside of that "main select" to be able to access the columns or something along those lines but i am lost in all the object types.
You have to assign your derived table to a local variable and dereference columns from it, e.g.
Table<?> t = table(
select(...).from(...).groupBy(...).unionAll(select(...).from(...).groupBy(...))
).as("t");
Field<Integer> tId = t.field(lieu.ID);
Okay so, this is my query.
select id from rooms where owner = 'oknow';
and the answer I get is
325
However, I made another SQL within this one as below
update users set home_room = 'mysql_fetch_assoc()' where username = 'omarisgod';
I want the 'mysql_fetchassoc()' to be the '325' value, how do I do this?
A subquery will do this:
UPDATE users SET home_room = (SELECT id FROM rooms WHERE owner = 'oknow') WHERE username = 'omarisgod';
You can conceptualize it thusly: The query inside parentheses will return a result, which will be utilized by the outer query.
I have tow tables, the first is mda_alert_info and the second is key_contacts_info. For each alert set up there may be multiple corresponding contacts. Both tables are linked by 3 columns mda_id, stage_id and ref_number and during the query I will have to pass figures values for them
How do I get all what I want from both tables in one statement. Below are the individual SELECT statements.
$result = mysql_query("SELECT `mda_name`, `project_name`, `ipc_id` FROM `mda_alert_info` WHERE `stage_id`=1 AND `mda_id`=2 AND `ref_number`= '444'");
This will always return one record
$result = mysql_query("SELECT `contact_role`, `contact_email`, `contact_ph_number` FROM `key_contacts_info` WHERE `stage_id`=1 AND `mda_id`=2 AND `role`=0 AND `ref_number`='444'");
This may return multiple records
I tried for a while and couldn't get it to work so I tried adding another field called 'me' to both tables which is basically concatting mda_id and stage_id strings then I tried the query below.
$result = mysql_query("SELECT key_contacts_info.contact_role, key_contacts_info.contact_email, key_contacts_info.contact_ph_number, mda_alert_info.mda_name, mda_alert_info.project_name, mda_alert_info.ipc_id FROM key_contacts_info LEFT JOIN mda_alert_info ON key_contacts_info.me = mda_alert_info.me WHERE stage_id=1 AND mda_id=2 AND role=0 AND ref_number='444'");
But it's still not working. What am I doing wrong and how do I get it to work.
UPDATE:
Sorry but I should clarify something on the relationship between the tables the three columns exist on each table but are not primary keys on either of the tables
SELECT a.*, b.*
FROM mda_alert_info a
INNER JOIN key_contacts_info b
ON a.mda_id = b.mda_id AND
a.stage_id = b.stage_id AND
a.ref_number = b.ref_number
WHERE b.role = 0 AND
a.stage_id = 1 AND
a.mda_id = 2 AND
a.ref_number = '444'
To further gain more knowledge about joins, kindly visit the link below:
Visual Representation of SQL Joins
select
a.mda_name,
a.project_name,
a.lpc_id,
k.contact_role,
k.contact_email,
k.contact_ph_number
from mda_alert_info a
join key_contacts_info k
on a.state_id = k.state_id
and a.mda_id = k.mda_id
and a.ref_number = k.ref_number
where a.state_id = 1
and a.mda_id = 2
and a.ref_number = '444'
and k.role = 0
;
MySQL Server Version: Server version: 4.1.14
MySQL client version: 3.23.49
Tables under discussion: ads_list and ads_cate.
Table Relationship: ads_cate has many ads_list.
Keyed by: ads_cate.id = ads_list.Category.
I am not sure what is going on here, but I am trying to use COUNT() in a simple agreggate query, and I get blank output.
Here is a simple example, this returns expected results:
$queryCats = "SELECT id, cateName FROM ads_cate ORDER BY cateName";
But if I modify it to add the COUNT() and the other query data I get no array return w/ print_r() (no results)?
$queryCats = "SELECT ads_cate.cateName, ads_list.COUNT(ads_cate.id),
FROM ads_cate INNER JOIN ads_list
ON ads_cate.id = ads_list.category
GROUP BY cateName ORDER BY cateName";
Ultimately, I am trying to get a count of ad_list items in each category.
Is there a MySQL version conflict on what I am trying to do here?
NOTE: I spent some time breaking this down, item by item and the COUNT() seems to cause the array() to disappear. And the the JOIN seemed to do the same thing... It does not help I am developing this on a Yahoo server with no access to the php or mysql error settings.
I think your COUNT syntax is wrong. It should be:
COUNT(ads_cate.id)
or
COUNT(ads_list.id)
depending on what you are counting.
Count is an aggregate. means ever return result set at least one
here you be try count ads_list.id not null but that wrong. how say Myke Count(ads_cate.id) or Count(ads_list.id) is better approach
you have inner join ads_cate.id = ads_list.category so Count(ads_cate.id) or COUNT(ads_list.id) is not necessary just count(*)
now if you dont want null add having
only match
SELECT ads_cate.cateName, COUNT(*),
FROM ads_cate INNER JOIN ads_list
ON ads_cate.id = ads_list.category
GROUP BY cateName
having not count(*) is null
ORDER BY cateName
all
SELECT ads_cate.cateName, IFNULL(COUNT(*),0),
FROM ads_cate LEFT JOIN ads_list
ON ads_cate.id = ads_list.category
GROUP BY cateName
ORDER BY cateName
Did you try:
$queryCats = "SELECT ads_cate.cateName, COUNT(ads_cate.id)
FROM ads_cate
JOIN ads_list ON ads_cate.id = ads_list.category
GROUP BY ads_cate.cateName";
I am guessing that you need the category to be in the list, in that case the query here should work. Try it without the ORDER BY first.
You were probably getting errors. Check your server logs.
Also, see what happens when you try this:
SELECT COUNT(*), category
FROM ads_list
GROUP BY category
Your array is empty or disappear because your query has errors:
there should be no comma before the FROM
the "ads_list." prefix before COUNT is incorrect
Please try running that query directly in MySQL and you'll see the errors. Or try echoing the output using mysql_error().
Now, some other points related to your query:
there is no need to do ORDER BY because GROUP BY by default sorts on the grouped column
you are doing a count on the wrong column that will always give you 1
Perhaps you are trying to retrieve the count of ads_list per ads_cate? This might be your query then:
SELECT `ads_cate`.`cateName`, COUNT(`ads_list`.`category`) `cnt_ads_list`
FROM `ads_cate`
INNER JOIN `ads_list` ON `ads_cate`.`id` = `ads_list`.`category`
GROUP BY `cateName`;
Hope it helps?
I've got 3 dataset objects that are nested with each other using entity set objects. I am selecting the data like this
var newList = from s in MainTable
from a in s.SubTable1 where a.ColumnX = "value"
from b in a.Detail where b.Name = "searchValue"
select new {
ID = s.ID,
Company = a.CompanyName,
Name = b.Name,
Date = s.DueDate
Colour = b.Colour,
Town = a.Town
};
and this works fine, but the trouble is there are many records in the Detail object-list/table for each Name value so I get a load of duplicate rows and thus I only want to display one record per b.Name. I have tried putting
group s by b.Name into g
before the select, but then this seems to stop the select enabling me to select the columns I want (there are more, in practice). How do I use the group command in this circumstance while still keeping the output rows in a "flat" format?
Appending comment as answer to close question:-
Of course that if you group your results, you cant get select a column of a child, thats because there may be more than one childs and you have to specify an aggregate column for example the sum,max etx –