i have two tables like
TABLE 1 : FACULTY_DETAILS
fac_det_id(pk)........fname...........availability
.....1......................... xxx.................full time
.....2......................... yyy.................part time
.....3......................... zzz.................weekdays
.....4......................... aaa.................partime
TABLE 2: FACULTY
faculty_id(pk)..........course_id........fac_det_id(fk)
.....1..............................1......................2
.....2..............................2......................3
.....3..............................3......................1
.....4..............................4......................3
.....5..............................3......................4
when i give course id
i need fname ,availability in table1 and faculty_id in table 2
ie if i give course_id=3 then i need like
faculty_id..........fname...........qualification
.....2...................xxx................full time
.....5...................aaa................partime
You can use this:
SELECT faculty_id, fname, availibility AS qualification
FROM faculty a, faculty_details b
WHERE a.fac_det_id = b.fac_det_id AND course_id = $your_course_id;
Try this:
SELECT f.faculty_id, fd.fname, fd.availability qualification
FROM FACULTY f
INNER JOIN FACULTY_DETAILS fd ON f.fac_det_id = fd.fac_det_id
WHERE f.course_id = 3
This should work
select f.faculty_id,fd.fname,fd.availability as qualification
from faculty f,faculty_details fd
inner join faculty_details fd ON f.fac_det_id = fd.fac_det_id
where course_id=3;
Related
i have the following tables:
Technician
Tech_ID,First_Name,Last_Name
RT_QUEUE_Delta
Tech_ID, RT_Complete` (references a `Tech_ID` in `Technician`).
I need to get the data from a row in RT_Queue_Delta where RT_Completed = ?? but in my output I need to have the First_Name and Last_name that correlates with Tech_id and RT_Completed.
I can match one but I don't know how to match both. I tried:
select RTTech.First_Name as RT_First_Name,
RTTech.Last_Name as RT_Last_Name
from Technician as RTTech
Join RT_Queue_Delta as RT
on RT.RT_Completed = RTTech.Tech_ID
You can join to the Technician table multiple times:
select d.tech_id, t.first_name, t.last_name,
d.rt_completed as completed_id,
t2.first_name as completed_first_name,
t2.last_name as completed_last_name
from RT_QUEUE_Delta d
join Technician t on d.tech_id = t.tech_id
join Technician t2 on d.RT_Completed = t2.tech_id
Hi i have 3 tables Modules,Students and join table (many to many) StudentModules.I want to select all modules that the student has not registered for.When the student register the information is stored in the StudentModules table.Basically i want to select all modules that are not associated with the student number in the StudentModules table from the Modules table.
i have tried the following code
SELECT Modules.*, Students.*
FROM ((StudentsModules INNER JOIN
Modules ON StudentsModules.ModuleCode = Modules.ModuleCode) INNER JOIN
Students ON StudentsModules.StudentNo = Students.StudentNo)
Where StudentNo = 48377767 AND WHERE ModuleCode NOT IN (SELECT ModuleCode FROM StudentsModules)
You're close, you forgot one check at the end!
Edit this part:
NOT IN (SELECT ModuleCode FROM StudentsModules where StudentNo=48377767)
One possible way to select all modules that the student has not registered for, assuming that the student no is 48377767 in this example :
SELECT m.*
FROM Modules m
LEFT JOIN StudentsModules sm ON sm.ModuleCode = m.ModuleCode
AND sm.StudentNo = 48377767
WHERE sm.ModuleCode IS NULL
[SQL Fiddle]
UPDATE :
Different approach without JOIN :
SELECT m.*
FROM Modules m
WHERE m.ModuleCode NOT IN
(
SELECT ModuleCode
FROM StudentsModules
WHERE StudentNo = 48377767
)
i have 4 tables
1. the first table(d_cities) for cities // related with the next table by country_id
CityId |CountryID |RegionID |City |Latitude|Longitude
2. the second table(d_country) for countries
CountryId|Country
3. the third table(ip2location_db11) for ip
ip_from|ip_to |country_code|country_name| city_name
4 the fourth table (ip_relation) would be like this
CountryID |CityId|ip_from |ip_to
i create the fourth table to collect custom data from the three tables and put it in one table..
this will has been done by :
join (d_country,d_cities) by id ,
then compare this names with IP table if matched
it will fetch the ids for these names & ips that matched and put it in the fourth table
..so i write my code like this and need to support to modify this code
INSERT ip_relations (CountryID, CityId,ip_from,ip_to)
SELECT *
FROM d_cities
INNER JOIN d_country ON d_cities.CountryID = d_country.CountryId
INNER JOIN ip2location_db11 ON ip2location_db11.country_name = d_country.Country
AND ip2location_db11.city_name = d_cities.City
/// this sql statement not work
first, i am not sure why do you design table like this.maybe you could change them like below:
d_cities: city_id | country_id | region_id |city | latitude| longitude
d_country: country_id | country
ip2location_db11: ip_from | ip_to | country_code | city_id
pS: I am not very sure what does country_code mean,so I keep it.base on the table structure above,it mostly like this: country to city is one-to-many and city_id must be unique, the ips is only have relation with the city_id.
I think ,this will be a better design...
then, if you have to solve the problem based on your current tables.
you would make a unique key "UNIQUE KEY uniq_from_to (ip_from,ip_to) "; and,there is sql:
INSERT IGNORE ip_relation
(SELECT cA.country_id,cA.city_id,ip.ip_from,ip.ip_to FROM ip2location_db11 ip
LEFT JOIN (SELECT cy.country,ct.city,ct.country_id,ct.city_id FROM d_country cy,d_cities ct WHERE cy.country_id = ct.country_id) as cA ON ip.city_name = cA.city AND ip.country_name = cA.country);
this means : 1.find All city-country groups;then based on the city-country groups;2.insert into your forth table,and when ip_from-ip_to is duplicate ,will cover the data before.
hope this can give you some help.
UPDATE ip_relations, ip2location_db11, d_cities, d_country
set ip_relations.countryid =d_country.CountryID
, ip_relations.cityid= d_cities.CityId
, ip_relations.ip_from=ip2location_db11.ip_from
, ip_relations.ip_to=ip2location_db11.ip_to
WHERE ip_relations.countryID=d_country.countryID and ip_relations.cityID=d_cities.CityID and ip_relations.ip_from=ip2location_db11.ip_from
and ip_relations.ip_to=ip2location_db11.ip_to;
Assuming country_id, city_id, countryname etc., being same through out all three tables:
SELECT
,dco.countryid AS countryid
,dci.cityid AS cityid
,ip_from
,ip_to
FROM d_country dco
INNER JOIN d_cities dci
ON dco.countryid=dci.countryid
INNER JOIN ip2location_db11 ip
ON TRIM(dci.city)=TRIM(ip.city_name)
AND TRIM(dco.country)=TRIM(ip.country_name)
WHERE dco.country_id=ip.country_code
UPDATE
ip_relation
FROM (
SELECT
,dco.countryid AS countryid
,dci.cityid AS cityid
,ip_from
,ip_to
FROM d_country dco
INNER JOIN d_cities dci
ON dco.countryid=dci.countryid
INNER JOIN ip2location_db11 ip
ON TRIM(dci.city)=TRIM(ip.city_name)
AND TRIM(dco.country)=TRIM(ip.country_name)
WHERE dco.country_id=ip.country_code
) DT
SET
ip_from=DT.ip_from
ip_to=DT.ip_to
WHERE CountryID=DT.countryid
AND CityId=DT.cityid
The correct way to join is here
UPDATE
ip_relations ir
INNER JOIN ip2location_db11 idl ON ir.ip_to = idl.ip_to
INNER JOIN ip2location_db11 idr ON ir.ip_from = idr.ip_from
INNER JOIN d_cities dc ON ir.d_cities = dc.d_cities
INNER JOIN d_country dct ON ir.countryID = dct.countryID
SET
ir.CountryID = dct.CountryID,
ir.CityId = dc.CityId,
ir.ip_from = dcr.ip_from,
ir.ip_to = dcl.ip_to
// put where condition if required
But when you are joining on some keys and want to update the keys i am sure all the keys will be same even after update so this will have no effect. If you update some else columns then it is practical.
To understand this assume this example.
joining two table on key which is 3. 3 is coming from 2nd table. updating column of first table with 3. So why do you need this? You need to update some else columns not the same ones you are joining.
INSERT INTO ip_relations (CityId,CountryID,ip_from,ip_to)
SELECT
d_cities.CityId,
d_cities.CountryID,
ip2location_db11.ip_from,
ip2location_db11.ip_to
FROM d_cities
INNER JOIN d_country ON d_cities.CountryID = d_country.CountryId
INNER JOIN ip2location_db11 ON ip2location_db11.country_name = d_country.Country
AND ip2location_db11.city_name = d_cities.City
I have a table in MySQL as follows.
Id Designation Years Employee
1 Soft.Egr 2000-2005 A
2 Soft.Egr 2000-2005 B
3 Soft.Egr 2000-2005 C
4 Sr.Soft.Egr 2005-2010 A
5 Sr.Soft.Egr 2005-2010 B
6 Pro.Mgr 2010-2012 A
I need to get the Employees who worked as Soft.Egr and Sr.Soft.Egr and Pro.Mgr. It is not possible to use IN or Multiple ANDs in the query. How to do this??
One way:
select Employee
from job_history
where Designation in ('Soft.Egr','Sr.Soft.Egr','Pro.Mgr')
group by Employee
having count(distinct Designation) = 3
What you might actually be looking for is relational division, even if your exercise requirements forbid using AND (for whatever reason?). This is tricky, but possible to express correctly in SQL.
Relational division in prosa means: Find those employees who have a record in the employees table for all existing designations. Or in SQL:
SELECT DISTINCT E1.Employee FROM Employees E1
WHERE NOT EXISTS (
SELECT 1 FROM Employees E2
WHERE NOT EXISTS (
SELECT 1 FROM Employees E3
WHERE E3.Employee = E1.Employee
AND E3.Designation = E2.Designation
)
)
To see the above query in action, consider this SQLFiddle
A good resource explaining relational division can be found here:
http://www.simple-talk.com/sql/t-sql-programming/divided-we-stand-the-sql-of-relational-division
If you need to get additional information back about each of the roles (like the dates) then joining back to your original table for each of the additional designations is a possible solution:
SELECT t.Employee, t.Designation, t.Years, t1.Designation, t1.Years, t2.Designation, t2.Years
FROM Table t
INNER JOIN t2 ON (t2.Employee = t.Employee AND t2.Designation = 'Sr.Soft.Egr')
INNER JOIN t3 ON (t3.Employee = t.Employee AND t3.Designation = 'Soft.Egr')
WHERE t.Designation = 'Pro.Mgr';
Why not the following (for postgresql)?
SELECT employee FROM Employees WHERE Designation ='Sr.Soft.Egr'
INTERSECT
SELECT employee FROM Employees WHERE Designation ='Soft.Egr'
INTERSECT
SELECT employee FROM Employees WHERE Designation ='Pro.Mgr'
Link to SQLfiddle
I know this might not optimized, but I find this much much easier to understand and modify.
Try this query:
SELECT DISTINCT t1.employee,
t1.designation
FROM tempEmployees t1, tempEmployees t2, tempEmployees t3
WHERE t1.employee = t2.employee AND
t2.employee = t3.employee AND
t3.employee = t1.employee AND
t1.designation != t2.designation AND
t2.designation != t3.designation AND
t3.designation != t1.designation
I have two tables..
Persons:
empid(primary key)
firstname
lastname
email
Details:
Did(primary key)
salary
designation
empid
Now I need to UPDATE email of the employee whose name is 'abc' AND designation is Manager.(lets suppose there are more than one employees names abc and therefore designation needs to be checked)
I am using sql server 2008
UPDATE p
SET email = 'newemail#wherever.com'
FROM dbo.Persons AS p
INNER JOIN dbo.Details AS d
ON p.empid = d.empid
WHERE p.firstname = 'abc'
AND d.Designation = 'manager';
Try This:
UPDATE
[Persons]
SET
[Persons].[email]='#######.###'
FROM
[Persons]
INNER JOIN [Persons].[empid]
ON [Details].[empid] = [Persons].[empid]
WHERE
[Persons].[firstname]='abc' AND
[Details].[designation]='Manager'