I have two tables as below.
Table 1
Book price
A 100
B 200
C 400
D 300
Table 2
Book price
A 100
B 200
C 400
Now I am executing below command as I want only the 4th record to get inserted into table 2. I want to add both the column names before NOT IN. what should I do?
Insert into table2 select * from table1 t1 where t1.book not in (select book from table2);
You can use NOT EXISTS along with matching the presumably primary key columns Book for both of the tables such as
INSERT INTO table2
SELECT *
FROM table1 t1
WHERE NOT EXISTS ( SELECT 0 FROM table2 WHERE Book=t1.Book);
Demo
P.S.: Should be careful about NULL values while using NOT IN operator. Moreover, using NOT IN is mostly less performant than using NOT EXISTS
I tried it and it looks fine to me.
may be you run the script twice so it will show 0 rows created in the second time.
make sure you committed the row.
Related
(P.S. I am still learning SQL and you can consider me a newbie)
I have 2 sample tables as follows:
Table 1
|Profile_ID| |Img_Path|
Table 2
|Profile_ID| |UName| |Default_Title|
My scenario is, from the 2nd table, i need to fetch all the records that contain a certain word, for which i have the following query :
Select Profile_Id,UName from
Table2 Where
Contains(Default_Title, 'Test')
ORDER BY Profile_Id
OFFSET 5 ROWS
FETCH NEXT 20 ROWS ONLY
(Note that i am setting the OFFSET due to requirements.)
Now, the scenario is, as soon as i retrieve 1 record from the 2nd table, i need to fetch the record from the 1st table based on the Profile_Id.
So, i need to return the following 2 results in one single statement :
|Profile_Id| |Img_Path|
|Profile_Id| |UName|
And i need to return the results in side-by-side columns, like :
|Profile_Id| |Img_Path| |UName|
(Note i had to merge 2 Profile_Id columns into one as they both contain same data)
I am still learning SQL and i am learning about Union, Join etc. but i am a bit confused as to which way to go.
You can use join:
select t1.*, t2.UName
from table1 t1 join
(select Profile_Id, UName
from Table2
where Contains(Default_Title, 'Test')
order by Profile_Id
offset 5 rows fetch next 20 rows only
) t2
on t2.profile_id = t1.profile_id
SELECT a.Profile_Id, a.Img_Path, b.UName
FROM table1 a INNER JOIN table2 b ON a.Profile_Id=b.Profile_Id
WHERE b.Default_Title = 'Test'
I have two tables that look like this:
table1:
table2:
and I'd like to merge them, to create a table with a header like this:
variablenname | mean | stddev | ms_form | dependent | fvalue | probf
The first nine rows should be the first table with empty values in the last 3 columns followed by the three rows from the second table with empty values in the first 4 columns. I'm sorry I can't post pictures or a third link, but my reputation is too low. I hope it's understandable.
I tried to create a new table and select everything from both with union but that didn't work. Can anybody help me?
Thanks!
You can use ALTER to add the last 3 columns to table 1. From there, INSERT table 2 onto table 1. So something like this.
ALTER table1 ADD dependent varchar(16)
ALTER table1 ADD favalue varchar(16)
ALTER table1 ADD probf varchar(16)
INSERT INTO table1(dependent, fvalue, probf)
SELECT * FROM table2
You can use a combination of joins and unions
LEFT JOIN the two tables in first query on fields that won't have a match
then UNION the second query with a RIGHT JOIN of the same tables.
The LEFT JOIN will only show results from the first table, then the RIGHT JOIN will only show results from the second
Something Like:
SELECT * FROM table1 as t1
LEFT JOIN table1 as t2 on t1.variablenname = t2.fValue
UNION
SELECT * FROM table1 as t1
RIGHT JOIN table1 as t2 on t1.variablenname = t2.fValue;
This is how I would like the final table to look like:
I have two table one is having all field VARCHAR2 but other having different type for different data.
For Example :
Table One
==========================
Col 1 VARCHAR2 UNIQUE KEY
Col 2 VARCHAR2
Col 3 VARCHAR2
===========================
Table Two
==========================
Col One VARCHAR2 UNIQUE KEY
Col Two TIMESTAMP
Col Three NUMBER
==========================
we are having one mapping table. it denotes which column of Table One has to compare with which column of Table Two.
For Example
Mapping Table
==============================
Table One Table Two
==============================
Col 1 Col One
Col 2 Col Three
Col 3 Col Two
==============================
Now with the help of UNIQUE KEY of TABLE ONE we have to find same row in TABLE TWO and compare rows column by column and get changes in data.
Currently we are using java program for comparing data row by row and column by column and getting changes between data in rows with same UNIQUE KEY. it is working fine but taking too much time as we are having 100000 records in DB.
Now my question is : is there any way i can compare data at SQL level and get changes in data?
You can do it 'manually' with a query like this: It's a lot of work, but there are only three different types of checks you need to do, so it's not very complex:
select
*
from
Table1 t1
full outer join Table2 t2 on t2.ID = t1.ID
where
-- Check ID, either record does not exist in either table.
t1.ID is null or
t2.ID = null or
-- Not nullable field can be easily compared.
t1.NotNullableField1 <> t2.NotNUllableField1 or
-- Nullable field is slightly more work.
t1.NullableField1 <> t2.NullableField1 or
(t1.NullableField1 is null and t2.NullableField1 is not null) or
(t1.NullableField1 is not null and t2.NullableField1 is null)
Another solution is to use MINUS, which is a bit like UNION, only it returns a dataset minus the records in a second dataset:
select * from Table1 t1
MINUS
select * from Table2 t2
This works only one way (which might be fine for your purpose), but you can also combine it with UNION to make it bidirectional.
select
*
from
( select * from Table1
MINUS
select * from Table2)
UNION ALL
( select * from Table2
MINUS
select * from Table1)
The output of both solutions is a bit different.
In the FULL OUTER JOIN query, the IDs will be joined and the values of the matching rows will be displayed next to each other as a single row.
In the MINUS query, the result will be presented as a single dataset. If a record does not exist in either one table, it will be displayed. If a record (ID) exists in both tables, but other fields are different, you will get both rows. So it's a bit harder to compare them.
See: http://www.techonthenet.com/oracle/minus.php
http://sqlfiddle.com/#!6/5ac78/1
Not sure if that fiddle will work. I want to return code 2 from the join on CHARINDEX.
As another example, I have a Description table (dt) that looks like this:
ID Description Code
158 INTEREST 199
159 INTEREST PAID 383
160 INTEREST PAYABLE ON ACCOUNT 384
And a master table (mt) with entries like this:
ID Narrative Code
1 INTEREST PAID NULL
I need to set the Code on the master table to 383. When I do an INSERT based on a JOIN using CHARINDEX(dt.Description, mt.Description) > 0, it sets the mt.Code to 199 every time.
How I can update the master table to pull the Code from Description table with the best match, not just the first matching instance?
Thanks!
You could just use a simple JOIN to find a match with a LEFT JOIN to eliminate all but the longest match;
UPDATE t1
SET t1.codeA = t2_1.codeB
FROM table1 t1
JOIN table2 t2_1
ON CHARINDEX(t2_1.colB, t1.colA) > 0
LEFT JOIN table2 t2_2
ON CHARINDEX(t2_2.colB, t1.colA) > 0
AND t2_1.codeB <> t2_2.codeB
AND LEN(t2_2.colB) > LEN(t2_1.colB)
WHERE t2_2.colB IS NULL;
An SQLfiddle to test with.
Note that it's (probably) not possible to make a CHARINDEX query like this one (or your original query) use indexes, so the query may be very slow for large amounts of data.
Also, always test first before running SQL updates from random people on the Internet on your production data :)
This is awkward, but it seems to work:
update table1
set codeA = (
select max(codeB)
from table2
where charindex(colB, colA) > 0
)
where exists (
select 1
from table2
where charindex(colB, colA) > 0
);
Revised fiddle is here: http://sqlfiddle.com/#!6/5ac78/12
The problem is knowing which is the "best" value to return. I have assumed the row with the maximum ID is the one you want.
I have a 2 tables I need to join, however on one of the tables I need to extract a key from a varchar field in each row.
Table 1 Description (numeric 18,varchar 4000)
descriptionid description
1 Blah Blah: Queue 1Blah Blah
2 foobar:Queue 2
3 rem:Queue 2 -This is a note
4 Anotherrow: Queue 3
5 Something else
Table 2 Queue - (numeric 18, varchar 100)
queueid queue
123 Queue 1
124 Queue 2
127 Queue 3
129 Queue 4
So I need to produce the output like so
View 3 Queue-Description (numeric 18, numeric 18)
descriptionid queueid
1 123
2 124
3 124
4 127
5 null
So in table 1 row 1, I need to strip out the value Queue1 from the description, verify it is in the queue table, and lookup the queueid.
I am unable to change the structure of tables 1 and 2.
What ways can this be achieved in MSSQL?
What is the most efficient way to do this in SQL - using MSSQL 2005 here.
most efficient way
Well... don't know about that but it is a way.
select T1.descriptionid,
T2.queueid
from Table1 as T1
left outer join Table2 as T2
on T1.description like '%'+T2.queue+'%'
Another way
select T1.descriptionid,
T2.queueid
from Table1 as T1
left outer join Table2 as T2
on charindex(T2.queue, T1.description, 1) > 0
If there are more than one match (see comment by Ed Harper) you can use this to pick the one with the longest match.
select T1.descriptionid,
T2.queueid
from Table1 as T1
outer apply (
select top 1 T3.queueid
from Table2 as T3
where charindex(T3.queue, T1.description, 1) > 0
order by len(T3.queue) desc
) as T2(queueid)
The most efficient way to do this is to add an extra column to your table and insert the extracted the ID from the string. You can do this when rows are added and you can process the existing ones fairly easily. But trying to left join like this will be very slow.
In Sql Server 2005 you can extract your queue string using regex. The Data Extraction section on this page contains an example.
In a stored procedure you can then build an indexed temp table that contains a new column - this allows you to do this without changing the table metadata).
If you can change the table metadata you can:
Trigger the content into another column (on insert).
Or if the information is not needed immediately a daily sql job could extract the information.