I am very new to postgresql. I want to create a temp table containing some values and empty columns. Here is my query but it is not executing, but gives an error at , (comma).
CREATE TEMP TABLE temp1
AS (
SELECT distinct region_name, country_name
from opens
where track_id=42, count int)
What did I do wrong?
How to create a temp table with some columns that has values using select query and other columns as empty?
Just select a NULL value:
CREATE TEMP TABLE temp1
AS
SELECT distinct region_name, country_name, null::integer as "count"
from opens
where track_id=42;
The cast to an integer (null::integer) is necessary, otherwise Postgres wouldn't know what data type to use for the additional column. If you want to supply a different value you can of course use e.g. 42 as "count" instead
Note that count is a reserved keyword, so you have to use double quotes if you want to use it as an identifier. It would however be better to find a different name.
There is also no need to put the SELECT statement for an CREATE TABLE AS SELECT between parentheses.
Your error comes form your statement near the clause WHERE.
This should work :
CREATE TEMP TABLE temp1 AS
(SELECT distinct region_name,
country_name,
0 as count
FROM opens
WHERE track_id=42)
Try This.
CREATE TEMP TABLE temp1 AS
(SELECT distinct region_name,
country_name,
cast( '0' as integer) as count
FROM opens
WHERE track_id=42);
Related
I'm trying to create a temp table in BigQuery, something like:
CREATE TEMP TABLE myTmpTable AS
SELECT t.event_id, MAX(t.event_date)
FROM eventsTable t
WHERE t.field_name = "foo"
AND t.new_string = "bar"
GROUP BY t.event_id;
This results in error "CREATE TABLE columns must be named, but column 2 has no name". I understand that it can't extract a column name from MAX(t.event_date). Is there a way I can specify a column name?
Is there a way I can specify a column name?
Use below
SELECT t.event_id, MAX(t.event_date) AS max_event_date
Meantime the whole SELECT looks wrong to me - if you group by issue_id then event_id should be somehow aggregated. Or you might want to group by event_id instead!
How can I get the hive column count names using HQL? I know we can use the describe.tablename to get the names of columns. How do we get the count?
create table mytable(i int,str string,dt date, ai array<int>,strct struct<k:int,j:int>);
select count(*)
from (select transform ('')
using 'hive -e "desc mytable"'
as col_name,data_type,comment
) t
;
5
Some additional playing around:
create table mytable (id int,first_name string,last_name string);
insert into mytable values (1,'Dudu',null);
select size(array(*)) from mytable limit 1;
This is not bulletproof since not all combinations of columns types can be combined into an array.
It also requires that the table will contain at least 1 row.
Here is a more complex but also stronger solution (types versa), but also requires that the table will contain at least 1 row
select size(str_to_map(val)) from (select transform (struct(*)) using 'sed -r "s/.(.*)./\1/' as val from mytable) t;
I have some select statements, one of them:
SELECT c_c.id,
c_c.full_name,
c_c.telephone,
c_c.fax,
cast(c_c.adress_juridical as varchar(256)) as adress_juridical,
cast(c_c.adress_naturale as varchar(256)) as adress_naturale,
c_c.director,
c_c.name,
c_c.b_id,
c_c.dt_start,
c_c.dt_end
FROM c_counteragents c_c
WHERE c_c.id = -1 AND c_c.b_id = -1;
How can I get names of select statement?
The names of columns of this select must be without allias c_c.
It's not so easy, just to take a table name and find table's columns names. I don't know the name of table, because I retrieve this SELECT statement from some table, where it stores as a text.
How do I create a temporary table in PostgreSQL that has one column "AC" and consists of these 4-digit values:
Zoom
Inci
Fend
In essence the table has more values, this should just serve as an example.
If you only need the temp table for one SQL query, then you can hard-code the data into a Common Table Expression as follows :
WITH temp_table AS
(
SELECT 'Zoom' AS AC UNION
SELECT 'Inci' UNION
SELECT 'Fend'
)
SELECT * FROM temp_table
see it work at http://sqlfiddle.com/#!15/f88ac/2
(that CTE syntax also works with MS SQL)
HTH
I am trying to update one table from another, im able to update fine as long as the customer record exists, but there are some entries that dont.
To solve this i've tried running the following insert
SELECT *
INTO SalBudgetCust
FROM SalBudgetCust_temp
WHERE NOT EXISTS (
SELECT Customer
FROM SalBudgetCust
WHERE Customer = SalBudgetCust_temp.Customer
)
but im prompted with
There is already an object named 'SalBudgetCust' in the database.
Im stuck at this point... could anyone offer a little guideance?
SELECT INTO implicitly creates the table you name. You should instead use INSERT INTO ... SELECT * FROM ..., so that the existing table is used.
It should be INSERT INTO instead of SELECT * INTO ... like
INSERT INTO SalBudgetCust SELECT * FROM SalBudgetCust_temp
WHERE NOT EXISTS
(
SELECT Customer FROM SalBudgetCust WHERE Customer = SalBudgetCust_temp.Customer
)
The general syntax to insert data of one table into another is :
INSERT INTO new_table
SELECT * FROM old_table
WHERE some_condition;
Where, new_table is the table where you want to insert data, old_table is table from where you are fetching data and some_condition is the expression / condition based upon which you want to fetch data from old table.
You may use other clauses like order by, group by, and even sub queries after where clause.
May refer this SQL INSERT INTO and it's subsequent pages.