Could anyone please let me know how I can perform the below in SnowFlake?
How can I pull data from two different tables in different schemas in the same database object in SnowFlake using a query? The two tables have a common field to join them.
How can I pull data from two different tables in different schemas in different database objects in SnowFlake using a query? the two tables have a common field to join them.
Thanks in advance!
It is easy to achieve using (fully-)qualified names:
SELECT *
FROM schema_name_1.tab_1 AS t1
JOIN schema_name_2.tab_2 AS t2
ON t1.col = t2.col;
SELECT *
FROM database_name_1.schema_name_1.tab_1 AS t1
JOIN database_name_2.schema_name_2.tab_2 AS t2
ON t1.col = t2.col;
Related
I have a SQL Server 2014 Express with multiple databases. One of them has general tables with information common to the remaining databases (let's call this database UniversalData).
The other databases have information that is pertinent to a specific site (let's call one of these databases Site01Data). The universal data may change and I don't want to replicate it regularly to the other site-specific databases, so I want to include the UniversalData table in some queries, some of which involve CTEs.
What I am trying to accomplish:
WITH CTE1 AS
(
SELECT *
FROM UniversalData.dbo.someTable
),
CTE2 AS
(
SELECT *
FROM Site01Data.dbo.anotherTable
),
CTE3 AS
(
SELECT CTE1.field1, CTE2.field2
FROM CTE1
JOIN CTE2 ON CTE1.idx = CTE2.idx
)
SELECT *
FROM CTE3;
This doesn't generate an error, but I seem to get no data from the CTE1 in my final query (null result set). Intuitively, does this mean it is saving a temp table in the UniversalData database that is not accessible from the Site01Data database?
How can I use a CTE with tables from different databases on the same server?
There are lots of ways to do this..
You could read the tables in one database into a temp table on the second database and then join to it.. or join both of them on the fly.
but first.. refrain from doing select *.. specify the columns
You could go
select t1.column1,t2.column2
from UniversalData.dbo.someTable t1
inner join Site01Data.dbo.anotherTable t2
on t2.ida = t2.idx
and so onn.. it depends on which way you want to specify the join and what sort of join you want to choose..
This assumes that both the data bases are on the same instance.. else you will need linked servers
Specify servername.site1data.dbo.table etc and use linked servers if appropriate across different servernames
I have a MSSQL database with 3 tables: Journals, Customers, and UserAccounts.
I'm trying to query Journals for transactions per account manager. This table has a customer ID column that links to Customers.
The Customers table has a ACC_Manager column that links to UserAccounts via UserID.
Inside the UserAcounts table are first and last name columns.
So it would be
Select
Journal.amount,
Customer.name,
UserAccounts.first
From
Tables
where
Journal.ACC_manager = 'Matt'
I'm having issues joining the tables so I can query using UserAccounts.first. Could anybody help? Thanks
Try the following. I didn't get exact column names so don't just use this code without modifying it a bit to suit your specific needs:
SELECT
j.amount,
c.name,
u.first
FROM
Journals j
JOIN Customers c ON
c.customerID = j.customerID -- Exact column names?
JOIN UserAccounts u ON
u.UserID = c.ACC_Manager
WHERE
u.first = 'Matt'
You may also need to use LEFT JOIN as opposed to JOIN. Read up on JOINs to be sure.
I am creating an SSIS package that will compare two tables and then insert data in another table.
Which tool shall I use for that? I tried to use "Conditional Split" but it looks like it only takes one table as input and not two.
These are my tables:
TABLE1
ID
Status
TABLE2
ID
Status
TABLE3
ID
STatus
I want to compare STATUS field in both tables. If Status in TABLE1 is "Pending" and in TABLE2 is "Open" then insert this record in TABLE3.
If your tables are not large you can use a Lookup transformation with Full Cache, but I wouldn't recommend it because if your tables grow you will run into problems. I know I did.
I would recommend Merge Join transformation. Your setup will include following:
two data sources, one table each
two Sort transformations, as Merge Join transformation needs sorted input; I guess you need to match records using ID, so this would be a sort criteria
one Merge Join transformation to connect both (left and right) data flows
one Conditional Split transformation to detect if there are correct statuses in your tables
any additionally needed transformation (e.g. Derived Column to introduce data you have to insert to your destination table)
one data destination to insert into destination table
This should help, as the article explains the almost exact problem/solution.
I managed to do it by using Execute SQL Task tool and writing the following query in it.
INSERT INTO TABLE3 (ID, Status)
SELECT * FROM TABLE1 t1, TABLE2 t2
WHERE t1.ID = t2.ID and t1.status = 'Pending' and t2.status = 'Open'
i think so this is what you are looking for.?
In your case if both the tables are Sql tables then follow the steps below
Drag dataflow task
Edit dataflow task add Oledb source and in sql command paste the below sql
code
add oledb destination and map the columns with table3
sql code
select b.id,b.status
from table1 a
join table2 b on a.id = b.id
where a.status = 'Pending' and b.status = 'open'
I think this will work for you.
I'm trying to create a little SQL script (in SQL Server Management Studio) to get a list of all tables in two different databases. The goal is to find out which tables exist in both databases and which ones only exist in one of them.
I have found various scripts on SO to list all the tables of one database, but so far I wasn't able to get a list of tables of multiple databases.
So: is there a way to query SQL Server for all tables in a specific database, e.g. SELECT * FROM ... WHERE databaseName='first_db' so that I can join this with the result for another database?
SELECT * FROM database1.INFORMATION_SCHEMA.TABLES
UNION ALL
SELECT * FROM database2.INFORMATION_SCHEMA.TABLES
UPDATE
In order to compare the two lists, you can use FULL OUTER JOIN, which will show you the tables that are present in both databases as well as those that are only present in one of them:
SELECT *
FROM database1.INFORMATION_SCHEMA.TABLES db1
FULL JOIN database2.INFORMATION_SCHEMA.TABLES db2
ON db1.TABLE_NAME = db2.TABLE_NAME
ORDER BY COALESCE(db1.TABLE_NAME, db2.TABLE_NAME)
You can also add WHERE db1.TABLE_NAME IS NULL OR db2.TABLE_NAME IS NULL to see only the differences between the databases.
As far as I know, you can only query tables for the active database. But you could store them in a temporary table, and join the result:
use db1
insert #TableList select (...) from sys.tables
use db2
insert #TableList2 select (...) from sys.tables
select * from #TableList tl1 join Tablelist2 tl2 on ...
Just for completeness, this is the query I finally used (based on Andriy M's answer):
SELECT * FROM DB1.INFORMATION_SCHEMA.Tables db1
LEFT OUTER JOIN DB2.INFORMATION_SCHEMA.Tables db2
ON db1.TABLE_NAME = db2.TABLE_NAME
ORDER BY db1.TABLE_NAME
To find out which tables exist in db2, but not in db1, replace the LEFT OUTER JOIN with a RIGHT OUTER JOIN.
I have an inline query, in which I have one table1 in server1 and another table2 in server2.
I need to join these two tables, and fetch data.
I can do this like connect to one server, get data and connect to next server...fetch data.
and join them.
But is there any other better way. I have heard about Linked servers. Will that help here ?
Thanks in advance !!!
Yes, set up a linked server on one server to the other. Then you can just do a normal query with a join. It would look something like this:
SELECT t1.Col1
, t2.ColA
FROM server1Table t1
INNER JOIN SERVER2.dbname.dbo.tableName t2 ON t1.TheId = t2.TheId
this assumes you're running the query on Server1. You can also have two linked servers and reference them both using [servername].[dbname].[schema].[table] and then use in SQL as normal.
Alternatively, you can use OPENROWSET (but linked server is easiest if you're able to set that up). OpenRowSets look like this:
SELECT t1.Col1
, t2.ColA
FROM server1Table t1
INNER JOIN OPENROWSET('SQLNCLI', 'Server=Server2;Trusted_Connection=yes;',
'SELECT t2.ColA, t2.TheId FROM dbname.dbo.tableName') AS t2
ON t1.TheId = t2.TheId
and then you can just join on 'a' as if it's a local table. Under the hood it's probably pulling all the data down to your local database, so you should consider adding WHERE to the inner query to restrict rows, and only get the columns you need.