I am using sqlite3.
Suppose I have a view view_intermediate. I would like to create a temporary table from this view. In other words, turn the result of the view into a temporary table.
How should the SQL statement look like to do this?
SQLite supports CREATE TABLE AS..SELECT, so assuming you want the data in the table:
CREATE TABLE myTable AS
SELECT *
FROM view_intermediate;
If you want a table to be created from the view, but don't want the data, you can add a false condition.
CREATE TABLE myTable AS
SELECT *
FROM view_intermediate
WHERE 1=2;
Related
I am creating a trigger in SQL to sum up all the values in a column after a change is made. I am stuck and encountering an error when I try this:
`
CREATE OR REPLACE TRIGGER GET_NUM_ATHLETES
AFTER DELETE OR UPDATE OF NUM_ATHLETES OR INSERT ON DELEGATION
BEGIN
SELECT
SUM("A1"."NUM_") "SUM(NUM_)"
INTO x_1 FROM
"DBF19"."DELEGATION" "A1";
END;
`
My table looks like this:
ID
Num_
ABC
2
XYZ
4
I just used the Oracle SQL Developer GUI to create, but obviously doing something wrong.
You could use a view instead of maintaining the data in a table. That way the view would get the results "live" each time.
And also you wouldn't need to do the extra task of loading data into another table
CREATE VIEW NUM_ATHLETES
AS
SELECT SUM("A1"."NUM_") "SUM(NUM_)"
FROM "DBF19"."DELEGATION" "A1";
Do not create a table, use a VIEW (or if you were doing more complicated calculations a MATERIALIZED VIEW):
DROP TABLE num_athletes;
then:
CREATE VIEW num_athletes (id, num) AS
SELECT id, SUM(num_)
FROM DBF19.DELEGATION
GROUP BY id;
I used below query to create the table from view:
create table <table_name> as (select * from <View_name> where column1 not in ());
No. The table is a new table with data that, after creation, is disconnected from the source.
I would like to create a temporary table as below in dremio
Select ABC into #temp_table
any advise?
I don't think DREMIO explicitly supports temporary tables. However, it does have the ability to create tables on the fly from the results of the query using create table as (CTAS):
create table temp_table as
select ABC;
Actually, I want to move one table to another database.
But spark don't permit this.
Then, how to copy table by spark-sql?
I already tried this.
SELECT *
INTO table1 IN new_database
FROM old_database.table1
But it was not working.
maybe try:
CREATE TABLE new_db.new_table AS
SELECT *
FROM old_db.old_table;
To preserve partitioning and storage format do the following-
Get the complete schema of the existing table by running-
show create table db.old_table
The above query will output the table schema which you can just execute after changing the path name and table name.
Then insert all the rows into the new blank table using-
insert into db.new_table select * from db.old_table
The following snippet will create a new table while preserving the definition of the "old" table.
CREATE TABLE db.new_table LIKE db.old_table;
For more info, check the doc's CREATE TABLE.
I want to create a table using CTAS of partitioned table.
New table must have all the data and partitions, subpartitions of old table.
How to do this?
You need to first create the new table with all the partitions, there is no way you can add partition definitions to a CTAS. Once the table is created you can populate it using insert into .. select.
You can use dbms_metadata.get_ddl to get the definition of the old table.
select dbms_metadata.get_ddl('TABLE', 'NAME_OF_EXISTING_TABLE')
from dual;
Save the output of that into a script, do a search and replace to adjust the table name, then run the create table and then run the insert into ... select ...