I'm migrating data from one table to another table in SQL Server, In this process what I need to do is "I have 10 columns in old table one column is 'CityName' which is varchar and in the new table, I have a column 'CityId' which is an integer. And I have other table which has data about city id and names. I need store the appropriate cityId in new table instead of CityName. Please help me. Thanks in advance.
You'll need to join the source table to the CityName field in the city information table:
INSERT INTO dbo.Destination (CityID, OtherStuff)
SELECT t1.CityID, t2.OtherStuff
FROM CityInformationTable t1
INNER JOIN SourceTable t2
ON t1.CityName = t2.CityName
Below should give you an idea, you need to inner join to your look up table to achieve this.
declare #t_cities table (Id int, City nvarchar(20))
insert into #t_cities
(Id, City)
values
(1, 'London'),
(2, 'Dublin'),
(3, 'Paris'),
(4, 'Berlin')
declare #t table (City nvarchar(20), SomeColumn nvarchar(10))
insert into #t
values
('London', 'AaaLon'),
('Paris', 'BeePar'),
('Berlin', 'CeeBer'),
('London', 'DeeLon'),
('Dublin', 'EeeDub')
declare #finalTable table (Id int, SomeColumn nvarchar(10))
insert into #finalTable
select c.Id, t.SomeColumn
from #t t
join #t_cities c on c.City = t.City
select * from #finalTable
Output:
Id SomeColumn
1 AaaLon
3 BeePar
4 CeeBer
1 DeeLon
2 EeeDub
Related
I have tables three tables: #T, #T1, #Maintable, for which I'll attach the corresponding DDL.
Create table #T ( id int , reason varchar (50));
insert into #T Values (1,'Texas for live music');
insert into #T Values (1,'Texas for BBQ');
insert into #T Values (2,'Wisconsin for dairy products');
insert into #T Values (2,'Wisconsin for Rock');
insert into #T Values (2,'Wisconsin for Bird');
insert into #T Values (3,'North Carolina for Pepsi');
insert into #T Values (4,'Missouri for Forest');
insert into #T Values (5,'Oklohoma for cowboy');
insert into #T Values (5,'Oklohoma for Native Americans');
insert into #T Values (5,'Oklohoma for oil and gas');
Create table #T1 ( id int , reason varchar (50));
insert into #T1 Values (1,'Texas for live music,BBQ');
insert into #T1 Values (2,'Wisconsin for dairy products, rock,bird');
insert into #T1 Values (3,'North Carolina for Pepsi');
insert into #T1 Values (4,'Missouri for Forest');
insert into #T1 Values (5,'Oklohoma for Native Americans,oil and gas');
Create table #MainTable (id int, State varchar(20),Capital varchar(30),Governer varchar(30));
Insert into #Maintable values (1,'Texas','Austin','A');
Insert into #Maintable values (2,'Wisconsin','Madison','B');
Insert into #Maintable values (3,'North Carolina','Releigh','C');
Insert into #Maintable values (4,'Missouri','Jefferson City','D');
Insert into #Maintable values (5,'Oklohoma','Oklohoma city','E');
Expected Output
ID
Reason
State
Capital
Governer
1
Texas for live music,BBQ
Texas
Austin
A
2
Wisconsin for dairy products, rock,bird
Wisconsin
Madison
B
3
North Carolina for Pepsi
North Carolina
Releigh
C
4
Missouri for Forest
Missouri
Jefferson City
D
5
Oklohoma for Native Americans,oil and gas
Oklohoma
Oklohoma city
E
I have a couple of tables, based on the criteria I will be filtering records from table #T and joining with other tables to get more columns but with the help of cte, I am not able to filter. if first table #T has more than one Id then we will be using reason from another table #T1. If it has only one Id then we will be using Reason from Table #T and finally, we will join with #main table to get other records. I have added an image describing more. Help is much appreciated. All those temp tables we can test
And the scenario is:
If reason appears more than once in #T table use #T1 table
If reason appears only once in the #T table use #T only, this is the first table
Here's my coding attempt:
with cte as (
select *, ROW_NUMBER() over (partition by id order by id) rn
from #T
)
select mt.id, state, capital, Governer,
case when c.rn > 1
then #t1.reason
else c.reason
end as reason
from cte c
join #t1 on c.id = #t1.id
join #maintable mt on c.id = mt.id
I am getting more results, I was expecting only 5 records. I guess there is some issue in my row_number. Help is appreciated.
You should first extract the ranking value from the table "#T" for each ID. Then you can use the COALESCE function in combination with LEFT JOIN operations to solve your problem:
WITH #T_ranked AS (
SELECT *, ROW_NUMBER() OVER(PARTITION BY id ORDER BY reason) AS rn
FROM #T
)
SELECT m.id,
COALESCE(#T1.reason, #T_ranked.reason) AS Reason,
m.State,
m.Capital,
m.Governer
FROM #Maintable m
LEFT JOIN #T1 ON m.id = #T1.id
LEFT JOIN #T_ranked ON m.id = #T_ranked.id AND #T_ranked.rn = 1
The LEFT JOIN operations will make your ids in the "MainTable" be kept, while the COALESCE function will make the first non-null argument to be the value for the "Reason" new field, in the specific case it will check whether "#T1.Reason" is null, if it is then it will assign "#T2.Reason". Values from "#T.Reason" which have an existing correspondent in "#T1.Reason" will never be selected in this way.
Check the demo here.
I'm new in query and SQL server, and I wanted to know about DDL.
I have an attribute in my Table which has more than 1 value, such as
Size = {'S', 'M', 'L'}.
How could i make the attribute in my Table with query, so i can insert multi values to one of my attribute?
You don't want to do this, because this is denormalizing your data. But, if you must.
declare #table table (id int identity(1,1), size varchar(16))
insert into #table
values
('S')
,('M')
select * from #table
update #table
set size = size + ',M'
where id = 1
select * from #table
Here is a one to many approach with a foreign key
create table #items (id int identity(1,1), descrip varchar(64))
insert into #items
values
('shirt'),
('pants')
create table #item_sizes (id int identity(1,1), size char(1), item_id int)
alter table #item_sizes
add constraint FK_item foreign key (item_id) references #items(id)
insert into #item_sizes
values
('S',1)
,('M',1)
,('L',1)
,('S',2)
select
ItemID = i.id
,i.descrip
,isiz.size
from #items i
inner join #item_sizes isiz
on isiz.item_id = i.id
drop table #items, #item_sizes
As per your requirement :
Product (...,ProductSize);
INSERT INTO Product (ProductSize) VALUES ('S')
How to query the row of ProductSize so i can insert more than one values in SQL? –
you can query like below
select * from Product where ProductSize like '%S%' or ProductSize like '%L%' or ProductSize like '%M%'
I have 3 tables
Staff table:
EmpId CandidateId
------------------------
1 2
Candidate table:
CandidateId Firstname Last name CountryId PassportCountry
--------------------------------------------------------------------
1 Mark Antony 2 3
2 Joy terry 1 3
Country:
CountryId Name
---------------------------
1 USA
2 UK
3 Australia
User will pass the EmpId in the querystring I need to show the candidate details according to the empId. I have only one country table and using that table for country, passportport country. So I need to get the country name when I get the candidate value.
How to write the stored procedure to get the candidate details. Im not good in sql. Can you guys help me on this. Thanks in advance.
Hi I tried the below script to get the country name and passport country name. I can get the country name, but not the passport country.
SELECT
FirstName,
LastName,
PassportCountry,
Country.CountryName as Country
from Candidate
inner join Country
on country.CountryId=candidate.country
where CandidateId=#CandidateId;
This should get you going in the right direction.
Basically, since you're referencing the Country table twice, you need to join it twice.
declare #staff table (EmpId int, CandidateId int)
insert into #staff values (1, 2 )
declare #Candidate table (CandidateId int, Firstname nvarchar(50), Lastname nvarchar(50), CountryId int, PassportCountry int)
insert into #Candidate
values (1, 'Mark', 'Antony', 2, 3),
(2, 'Joy', 'Terry', 1, 3)
declare #Country table (CountryId int, Name nvarchar(50))
insert into #Country
values (1, 'USA'),
(2, 'UK'),
(3, 'Australia')
declare #empID int
set #empID = 1
SELECT
FirstName,
LastName,
t2.Name as PersonCountry,
t3.Name as PassportCountry
from #staff s
inner join #Candidate t1 on s.CandidateId = t1.CandidateId
inner join #Country t2 on t1.CountryId=t2.CountryId
inner join #Country t3 on t1.PassportCountry=t3.CountryId
where s.EmpId=#empID;
I am trying to write a query that will insert a group of people into a table if that person does not exist. For example, I have table full of people and I need to add more people into the database and I don't know if they are already there. I do know that the social security number (ssn) will never be the same for two people. Could a query be used to check if the ssn is in the table and if not insert the person into the table? If the ssn is in the table then go to the next person and check?
I was thinking about using a stored procedure, but I do not have any rights to create a store procedure.
You can insert your data into a table variable or temp table and then INSERT INTO table from temp table where it does not exists in your table.
DECLARE #Inserted AS TABLE
(
NAME VARCHAR(50)
,SSN DECIMAL(10, 0)
)
INSERT INTO #Inserted
( NAME, SSN )
VALUES ( 'Bob', 123456789 )
, ( 'John', 123546789 )
, ( 'James', 123456798 )
INSERT INTO MyTable
SELECT *
FROM #Inserted AS i
LEFT OUTER JOIN MyTable AS m
ON i.SSN = m.SSN
WHERE m.SSN IS NULL
Here are a couple ideas to get you started. I use MERGE a lot because it offers so much control. You could also look into the IN clause as part of a WHERE predicate in the INSERT SELECT statement.
MERGE
DECLARE #PERSONTABLE TABLE (ID INT PRIMARY KEY IDENTITY(1,1), FirstName VARCHAR(max))
INSERT INTO #PERSONTABLE (FirstName) VALUES ('Bill'),('Sally'),('Bob')
DECLARE #NEWPEOPLE TABLE (FirstName VARCHAR(max))
INSERT INTO #NEWPEOPLE (FirstName) VALUES ('Jim'), ('Sally')
--MERGE
MERGE INTO #PERSONTABLE AS T
USING #NEWPEOPLE AS S
ON (T.FirstName = S.FirstName)
WHEN NOT MATCHED BY TARGET THEN
INSERT (FirstName) VALUES (S.FirstName);
SELECT * FROM #PERSONTABLE
EXCEPT
DECLARE #PERSONTABLE TABLE (ID INT PRIMARY KEY IDENTITY(1,1), FirstName VARCHAR(max))
INSERT INTO #PERSONTABLE (FirstName) VALUES ('Bill'),('Sally'),('Bob')
DECLARE #NEWPEOPLE TABLE (FirstName VARCHAR(max))
INSERT INTO #NEWPEOPLE (FirstName) VALUES ('Jim'), ('Sally')
--EXCEPT
INSERT INTO #PERSONTABLE (FirstName)
SELECT FirstName FROM #NEWPEOPLE
EXCEPT
SELECT FirstName FROM #PERSONTABLE
SELECT * FROM #PERSONTABLE
You could do it like this if the new people are in another table. If not, then use Vladimir's solution.
INSERT INTO People(ssn, firstname, lastname)
SELECT ssn, firstname, lastname
FROM newpeople
WHERE ssn not in (select ssn from people )
INSERT INTO People(ssn, firstname, lastname)
SELECT np.ssn, np.firstname, np.lastname
FROM newpeople np
LEFT JOIN People p on np.ssn = p.ssn
WHERE p.ssn IS NULL
Here's another option I use a lot. Normally joins are better than sub-selects... if the joined table value is null you know you don't have a hit in the joined table.
DROP TABLE #ABC
CREATE TABLE #ABC (ID INT, Name VARCHAR (2))
INSERT INTO #ABC (ID, NAME)
VALUES (1,'01'),(1,'F5'),(1,'05'),(2,'08'),(2,'G4'),(3,'Y7'),(3,'18')
drop table #XYZ
CREATE TABLE #XYZ (ID INT, Name char(20))
INSERT INTO #XYZ (ID,Name)
SELECT ID, SUBSTRING(REPLACE(CONVERT(VARCHAR(36), NEWID()) , '-', ''), 0, 3) from #ABC
Select * from #XYZ
I want the process to create a new name which is already not taken by the same ID. in other words, same ID (say ID =1) can not have the same "Name" columns. This is just very few records but my real data is huge, I want system to generate only new Names with 2 characters in table#XYZ which are already not taken by the same ID in #ABC. Any help is appreciated. Thanks
I added another temp table #DEF to hold the Names you're generating from NEWID(). It's a little clearer to use SUBSTRING('123456', 1, 2) to obtain the first two characters. I also added a GROUP BY ID so that it will generate only one Name per ID.
Finally, I used a LEFT JOIN and a NULL match to look for #DEF entries that were not already present in #ABC.
DROP TABLE #ABC
CREATE TABLE #ABC (ID INT, Name VARCHAR (2))
INSERT INTO #ABC (ID, NAME)
VALUES (1,'01'),(1,'F5'),(1,'05'),(2,'08'),(2,'G4'),(3,'Y7'),(3,'18')
DROP TABLE #DEF
CREATE TABLE #DEF (ID INT, Name char(20))
INSERT INTO #DEF (ID, Name)
SELECT ID, SUBSTRING(REPLACE(CONVERT(VARCHAR(36), NEWID()) , '-', ''), 1, 2) AS Name
FROM #ABC
GROUP BY ID
DROP TABLE #XYZ
CREATE TABLE #XYZ (ID INT, Name char(20))
INSERT INTO #XYZ (ID, Name)
SELECT #DEF.ID, #DEF.Name
FROM #DEF
LEFT JOIN #ABC ON #ABC.ID = #DEF.ID AND #ABC.Name = #DEF.Name
WHERE #ABC.ID IS NULL
GROUP BY #DEF.ID, #DEF.Name
SELECT * FROM #XYZ
Does this work for you?