Please help me with this question. Am trying to copy the table structure from one user to another in SQL 9i. Can you help me with how to do this. i have a fair bit of idea of how to copy a table from one user to another but i dont know how to just copy the table structure wth no records.
oracle:
create table new_table as select * from old_table where 0 = 1
sql server:
select * into new_table from old_table where 0 = 1
In Oracle9i, we can also copy the table structure from following query:
create table copy_course as
select * from course where 1=2;
Related
I have a Snowflake stored procedure and I want to use "insert into" without hard coding column names.
INSERT INTO MEMBERS_TARGET (ID, NAME)
SELECT ID, NAME
FROM MEMBERS_STREAM;
This is what I have and column names are hardcoded. The query should copy data from MEMBERS_STREAM to MEMBERS_TARGET. The stream has more columns such as
METADATA$ACTION | METADATA$ISUPDATE | METADATA$ROW_ID
which I am not intending to copy.
I don't know of a way to not copy the METADATA columns if not hardcoding. However if you don't want the data maybe the easiest thing to do is to add them to your target, INSERT using a SELECT * and later in the sp set them to NULL.
Alternatively, earlier in your sp, run an ALTER TABLE ADD COLUMN to add the columns, INSERT using SELECT * and then after that run an ALTER TABLE DROP COLUMN to remove the columns? That way your table structure stays the same, albeit briefly it will have some extra columns.
A SELECT * is not usually recommended but it's the easiest alternative I can think of
I have a sqlite database that I'm trying to build a query. The table column I need to retrieve is iEDLID from the table below :
Right now all I have to go on is a known iEventID from the table below :
And the the nClientLocationID from the table below.
So the requirements are I need to get current iEDLID to write, lookup from tblEventDateLocations for dEventDate and the tblLocation.nClientLocationID based on the tblLocations.iLocationID I already have and event selected on this screen.
So I would need a query that does a "SELECT DISTINCT table EventDateLocations.iEDLID FROM tblEventDateLocations ...."
So basically from another query I have the iEventID I need, and I have the event ID i need but where the dEventDate=(select date('now')) I need to retrieve the iEventDateID from table EventDates.iEventDateID to use on the table EventDateLocations
this is the point where I'm trying to wrap my head around the joins for this query and the syntax...
It seems like you want this:
select distinct edl.iEDLDID
from
tblEventDateLocations edl
join tblEventDates ed on edl.EventDateId = ed.EventDateId
where
ed.EventId = ?
and ed.dEventDate = date('now')
and edl.nClientLocationID = ?
where the ? of course represent the known event ID and location ID parameters.
Since nClientLocationId appears on table tblEventDateLocations you do not need to join table tblLocations unless you want to filter out results whose location ID does not appear in that table.
I want to update whole table from on query. Following is my update functionality is happened:
Database (Database A) stored in the iDevice
Temperory Database (Batabase B) downloads to the device and store in the temp folder inside the device. (Both DB has same database structure)
First I attach temp db to device database. Attached db name is SECOND1
Then I insert new records from temp db to device folder from following Insert code. It is working fine.
INSERT INTO main.fList SELECT * FROM SECOND1.fList WHERE not exists (SELECT 1 FROM main.fList WHERE main.fList.GUID = SECOND1.fList.GUID)
But when I use following code to update it is not working fine. It update same top value for all device db table's rows.
UPDATE fList SET Notes = (SELECT SECOND1.fList.Notes FROM SECOND1.fList WHERE SECOND1.fList.GUID = fDefectList.GUID) WHERE EXISTS (SELECT * FROM SECOND1.fList WHERE SECOND1.fList.GUID = fList.GUID
I found SQL query for bulk update. Following is the code,
UPDATE fTempRank7
SET
fTempRank7.int_key = fRank7.int_key,
fTempRank7.int_rank6 = fRank7.int_rank6,
fTempRank7.title = fRank7.title,
fTempRank7.sequence = fRank7.sequence,
fTempRank7.lastupdated = fRank7.lastupdated
FROM
fTempRank7 INNER JOIN fRank7 ON
fTempRank7.int_key = fRank7.int_key
But in sqlite this code does not work.
Anyone knows bulk update in sqlite?
SQLite does not support joins in an UPDATE statement.
When you use a table name without a database name, it refers to the first matching table in the innermost query. In other words, if you use SECOND1.fList in a subquery, any other occurrence of fList refers to the table in SECOND1.
To ensure that you always refer to the correct table, use the database name in all table references.
The main database is always named main, so all table references should be either main.fList or SECOND1.fList.
Anyway, if you are updating all columns, you can simplify the update by deleting the rows that would be updated, so that all new data can just be inserted:
BEGIN;
DELETE FROM fList WHERE GUID IN (SELECT GUID FROM SECOND1.fList);
INSERT INTO fList SELECT * FROM SECOND1.fList;
COMMIT;
When you have a UNIQUE constraint on the GUID column, this can be simplified into a single statement:
INSERT OR REPLACE INTO fList SELECT * FROM SECOND1.fList;
And here I don't use main. because I know what I'm doing. ☺
I have to back up a table, which can change number of column. When my etl script starts it doesn't know the number of column. How can I create INSERT INTO table VALUES (?1, ?2, ...) script on the fly?
Regards,
Jacek
Depending on the database, one can use CREATE TABLE FROM SELECT (or similar) to back up the table. Example:
CREATE TABLE new_table AS (SELECT * FROM old_table);
I have two tables - tool_downloads and tool_configurations. I am trying to retrieve the most recent build date for each tool in my database. The layout of the DB is simple. One table called tool_downloads keeps track of when a tool is downloaded. Another table is called tool_configurations and stores the actual data about the tool. They are linked together by the tool_conf_id.
If I run the following query which omits dates, I get back 200 records.
SELECT DISTINCT a.tool_conf_id, b.tool_conf_id
FROM tool_downloads a
JOIN tool_configurations b
ON a.tool_conf_id = b.tool_conf_id
ORDER BY a.tool_conf_id
When I try to add in date information I get back hundreds of thousands of records! Here is the query that fails horribly.
SELECT DISTINCT a.tool_conf_id, max(a.configured_date) as config_date, b.configuration_name
FROM tool_downloads a
JOIN tool_configurations b
ON a.tool_conf_id = b.tool_conf_id
ORDER BY a.tool_conf_id
I know the problem has something to do with group-bys/aggregate data and joins. I can't really search google since I don't know the name of the problem I'm encountering. Any help would be appreciated.
Solution is:
SELECT b.tool_conf_id, b.configuration_name, max(a.configured_date) as config_date
FROM tool_downloads a
JOIN tool_configurations b
ON a.tool_conf_id = b.tool_conf_id
GROUP BY b.tool_conf_id, b.configuration_name