I am trying to drop a number of columns after joining three tables. I came across a very useful SO post: SQL exclude a column using SELECT * [except columnA] FROM tableA?
However I can't get the solution I found therein (the top answer) to work for my case;
joining multiple tables, and want to drop the key that is used for the second and third tables, as well as some other columns.
Here is a simplified case whereby I'm just attempting to drop the key of the second table, which comes out as mykey_2:
SELECT * INTO Temptable
FROM
table_1 INNER JOIN table_2 ON
table_1.mykey=table_2.mykey INNER JOIN
table_3 ON table_1.mykey= table_3.mykey
WHERE table_1.A_FIELD = 'Some Selection'
ALTER TABLE Temptable
DROP COLUMN table_2.mykey
GO
SELECT * FROM Temptable
DROP TABLE Temptable
My console is giving me the error "ORA-00933: SQL command not properly ended".
How can I achieve this dropping of specific columns from the final selection?
For information I'm querying an Oracle database using Toad.
Related
First: I'm working on a existing code and want to add some new stuff to it and I'm really new to ABAP
My goal: I want to duplicate an existing table and remove all values that occur multiple times. That - at least I think - works. Afterwards I want to INNER JOIN this new created table with another already existing table, but unfortunately I always get the following error:
Method MethodName "newCreatedTable" is not defined in the ABAP Dictionary as a table, projection view, or database view
Additional Info: As you can see I'm working inside of a method!
Here is my code what I've done so far:
creating new table and delete all duplicates
DATA newCreatedTable TYPE STANDARD TABLE OF existingTable.
SELECT columnName
FROM existingTable INTO TABLE newCreatedTable.
DELETE ADJACENT DUPLICATES
FROM newCreatedTable COMPARING columnName.
here is where the error happens
SELECT *
FROM anotherExistingTable as p
INNER JOIN newCreatedTable as t on t~columnName = p~columnName
...
I hope someone can help me out in this case! Thank You in advance!
If I'm not wrong your code looks like this:
DATA newCreatedTable TYPE STANDARD TABLE OF existingTable.
SELECT columnName FROM existingTable INTO TABLE newCreatedTable.
DELETE ADJACENT DUPLICATES
FROM newCreatedTable COMPARING columnName.
SELECT *
FROM anotherExistingTable
INNER JOIN newCreatedTable as t on t~columnName = p~columnName
If this is the case then you cannot make a SELECT on an internal table. You can only make this operation on a table that exists in the ABAP dictionary.
Your code should look like this:
DATA newCreatedTable TYPE STANDARD TABLE OF existingTable.
SELECT columnName
FROM existingTable INTO TABLE #newCreatedTable.
DELETE ADJACENT DUPLICATES FROM newCreatedTable COMPARING columnName.
SELECT *
FROM anotherExistingTable
FOR ALL ENTRIES IN #newCreatedTable " <-------------- Use FOR ALL ENTRIES
WHERE columnName = #newCreatedTable-columnName. " <-- in your code
I have a table that has a primary key WORKITEMID, and the following 3 foreign keys PRODSERVID,PROCESSID,and TASKKNOWID.
I have a view that I can create that also has PRODSERVID,PROCESSID, AND TASKKNOWID. This view will usually have ALL the records in above table plus some new ones - not in the table. The 'table' by definition is meant to hold the unique combinations of PRODSERVID, PROCESSID, and TASKKNOWID.
I would like to insert from the view into the table any new combinations in the view not present in the table. And I don't want to overwrite the existing WORKITEMIDs in the INSERT- because those WORKITEMIDs are used elsewhere.
Can this be done in SQL?
Thanks
Absolutely, the simplest form of criteria for this is to use the negation of EXISTS()
INSERT INTO [TableName] (PRODSERVID,PROCESSID,TASKKNOWID,... )
SELECT PRODSERVID,PROCESSID,TASKKNOWID,...
FROM [ViewName] v
WHERE NOT EXISTS (
SELECT 1 FROM [TableName] t
WHERE t.PRODSERVID = v.PRODSERVID AND t.PROCESSID = v.PROCESSID AND t.TASKKNOWID = v.TASKKNOWID
)
replace the ... with your other fields
You could also use a non-corellating outer join but I find not exists makes the intent much clearer.
There is a good comparison of the different approaches to this issue in this article: T-SQL commands performance comparison – NOT IN vs SQL NOT EXISTS vs SQL LEFT JOIN vs SQL EXCEPT
I need to create a stored procedure for comparing two tables. The input parameters are table names (containing schema). Knowing the names of the tables to be compared, I go to INFORMATION_SCHEMA.COLUMNS to get the list of columns for each table.
The problem is that in the database there are tables having columns populated automatically, e.g. 'created_by' and 'created_date'. When comparing the tables I should not pay attention to the differences in these columns if the rest of the data is the same.
Is there a common approach for finding such columns?
I've found this answer, it may help you: SQL exclude a column using SELECT * [except columnA] FROM tableA?
/* Get the data into a temp table */
SELECT * INTO #TempTable
FROM YourTable
/* Drop the columns that are not needed */
ALTER TABLE #TempTable
DROP COLUMN ColumnToDrop
/* Get results and drop temp table */
SELECT * FROM #TempTable
DROP TABLE #TempTable
In that way you're removing the columns you don't want to compare, so you have that "TempTable" for the comparison in your SP
So i have 2 very similar databases, they are identical except for the data that exists in the tables. I want to copy the data from the EQUIP_MODEL table that exists in the PILOT database to the EQUIP_MODEL table that exists in the DOMAIN database.
Is this even possible? or do i have to do manual inserts for all the data?
You can use fully qualified names in Insert statement
INSERT INTO DOMAIN.SCHEMANAME.EQUIP_MODEL (col1,col2,col3...)
SELECT col1,col2,col3.. FROM PILOT.SCHEMANAME.EQUIP_MODEL
To get the foreign key values (not the exact code you have to alter based on column name and mapping)
INSERT INTO DOMAIN.SCHEMANAME.EQUIP_MODEL
(id,col2,col3)
SELECT sp.id,
col2,
col3
FROM PILOT.SCHEMANAME.EQUIP_MODEL em
JOIN PILOT.SCHEMANAME.Prent_table p
ON em.id = p.id
JOIN DOMAIN.SCHEMANAME.parent_table sp
ON sp.somename_number_col = p.somename_number_col
I am trying to insert data from one of my existing table into another existing table.
Is it possible to insert data into any existing table using select * into query.
I think it can be done using union but in that case i need to record all data of my existing table into temporary table, then drop that table and finally than apply union to insert all records into same table
eg.
select * into #tblExisting from tblExisting
drop table tblExisting
select * into tblExisting from #tblExisting union tblActualData
Here tblExisting is the table where I actually want to store all data
tblActualData is the table from where data is to be appended to tblExisting.
Is it right method.
Do we have some other alternative ?
You should try
INSERT INTO ExistingTable (Columns,..)
SELECT Columns,...
FROM OtherTable
Have a look at INSERT
and SQL SERVER – Insert Data From One Table to Another Table – INSERT INTO SELECT – SELECT INTO TABLE
No, you cannot use SELECT INTO to insert data into an existing table.
The documentation makes this very clear:
SELECT…INTO creates a new table in the default filegroup and inserts the resulting rows from the query into it.
You generally want to avoid using SELECT INTO in production because it gives you very little control over how the table is created, and can lead to all sorts of nasty locking and other performance problems. You should create schemas explicitly and use INSERT - even for temporary tables.
#Ryan Chase
Can you do this by selecting all columns using *?
Yes!
INSERT INTO yourtable2
SELECT * FROM yourtable1
Update from CTE? http://www.sqlservercentral.com/Forums/Topic629743-338-1.aspx