I have a PostgreSQL query, where I create temp table by joining another temp table, and table from my database.
DROP TABLE IF EXISTS other_temp_table;
CREATE TEMP TABLE other_temp_table AS
SELECT *
FROM base.main_data
WHERE period_start_time::DATE >= '2017-06-20' AND period_start_time::DATE <= '2017-07-26';
------------------------------------------------------------------------------------------------------------------------
DROP TABLE IF EXISTS first_temp_table;
CREATE TEMP TABLE first_temp_table AS
SELECT *
FROM _temp_table
LEFT JOIN base."UL_parameters"
ON temp_table.base_col::INT = base."UL_parameters".base_col::INT
and temp_table.sec_col::INT= base."UL_parameters".sec_col::INT;
Now, the problem is `ERROR: column "sec_col" specified more than once.
But when I delete sec_col join condition and do just base_col, everything is ok. I think that I need to create an alias, but not sure how.
I think that the problem is that there is a sec_col column in both joined tables. Try to replace select * with select column1, column2, ....
It's a good practice to avoid select * in general, because it can cause errors when the table definition changes.
Related
I have been going through the threads about removing duplicates from a table and keeping one copy .I have seen an illustration in the case one have a table with composite key.anyone with the idea ?
table contr with composite key checkno,salary_month,sal_year
delete (select * from CONTR t1
INNER JOIN
(select CHECKNO, SALARY_YEAR,SALARY_MONTH FROM CONTR
group by CHECKNO, SALARY_YEAR,SALARY_MONTH HAVING COUNT(*) > 1) dupes
ON
t1.CHECKNO = dupes.CHECKNO AND
t1.SALARY_YEAR= dupes.SALARY_YEAR AND
t1.SALARY_MONTH=dupes.SALARY_MONTH);
I expected one duplicate to be removed and one maintained.
You can use this query below to remove duplicates by using rowid as having a unique valued column :
delete contr t1
where rowid <
(
select max(rowid)
from contr t2
where t2.checkno = t1.checkno
and t2.salary_year = t1.salary_year
and t2.salary_month = t1.salary_month
);
Demo
Another way to achieve this assuming you have dupes with 3 columns you have mentioned is
Create a temp table with distinct values
Drop your table
Rename the temp table
Especially if you are dealing huge volume of data this way would be a lot faster than delete.
If the dup data you are working on is subset of your main table the steps would be
Create a temp table with distinct values
Delete all dup columns from main table
Insert data from temp table to main table
The SQL for the first step would be
create table tmp_CONTR AS
select distinct CHECKNO, SALARY_YEAR,SALARY_MONTH -- this part can be modified to match your needs
from CONTR t1;
I'm trying to do a job that will copy data from a foreign table called "m_aduana" of the schema "nathalia" to my schema "publico" and my table "mae_aduana".
I need to do a query that copies all the values from the table "m_aduana" avoiding duplicates.
I got something like this for now but the result sends me an Insert 0 0, which means nothing is inserted.
insert into publico.mae_aduana(cod_aduana,nom_aduana,des_aduana,cod_aduana1,cod_aduana2,cod_aduana3,est_aduana)
select cod_aduana,nom_aduana,des_aduana,cod_aduana1,cod_aduana2,cod_aduana3,est_aduana
from nathalia.m_aduana
where not exists (
select * from publico.mae_aduana ma_ad, nathalia.m_aduana m_ad
where ma_ad.cod_aduana = m_ad.cod_aduana)
I think you have an error in the inner select. You don't need to use again the table nathalia.m_aduana. If should be something like:
insert into publico.mae_aduana(cod_aduana,nom_aduana,des_aduana,cod_aduana1,cod_aduana2,cod_aduana3,est_aduana)
select cod_aduana,nom_aduana,des_aduana,cod_aduana1,cod_aduana2,cod_aduana3,est_aduana
from nathalia.m_aduana
where not exists (
select * from publico.mae_aduana ma_ad
where ma_ad.cod_aduana = nathalia.m_aduana.cod_aduana)
You might want to change the where exists part like below
from nathalia.m_aduana m
where not exists (
select 1 from publico.mae_aduana
where cod_aduana = m.cod_aduana)
I'm doing a data conversion between systems and have prepared a select statement that identifies the necessary rows to pull from table1 and joins to table2 to display a pair of supporting columns. This select statement also places blank columns into the result in order to format the result for the upload to the destination system.
Beyond this query, I will also need to update some column values which I'd like to do in a separate statement operation in a new table. Therefore, I'm interested in running the above select statement as a subquery inside a SELECT INTO that will essentially plop the results into a staging table.
SELECT
dbo_tblPatCountryApplication.AppId, '',
dbo_tblPatCountryApplication.InvId,
'Add', dbo_tblpatinvention.disclosurestatus, ...
FROM
dbo_tblPatInvention
INNER JOIN
dbo_tblPatCountryApplication ON dbo_tblPatInvention.InvId = dbo_tblPatCountryApplication.InvId
ORDER BY
dbo_tblpatcountryapplication.invid;
I'd like to execute the above statement so that the results are dumped into a new table. Can anyone please advise how to embed the statement into a subquery that will play nicely with a SELECT INTO?
You can simply add an INTO clause to your existing query to create a new table filled with the results of the query:
SELECT ...
INTO MyNewStagingTable -- Creates a new table with the results of this query
FROM MyOtherTable
JOIN ...
However, you will have to make sure each column has a name, as in:
SELECT dbo_tblPatCountryApplication.AppId, -- Cool, already has a name
'' AS Column2, -- Given a name to create that new table with select...into
...
INTO MyNewStagingTable
FROM dbo_tblPatInvention INNER JOIN ...
Also, you might like to use aliases for your tables, too, to make code a little more readable;
SELECT a.AppId,
'' AS Column2,
...
INTO MyNewStagingTable
FROM dbo_tblPatInvention AS i
INNER JOIN dbo_tblPatCountryApplication AS a ON i.InvId = a.InvId
ORDER BY a.InvId
One last note is that it looks odd to have named your tables dbo_tblXXX as dbo is normally the schema name and is separated from the table name with dot notation, e.g. dbo.tblXXX. I'm assuming that you already have a fully working select query before adding the into clause. Some also consider using Hungarian notation in your database (tblName) to be a type of anti-pattern to avoid.
If the staging table doesn't exist and you want to create it on insert then try the following:
SELECT dbo_tblPatCountryApplication.AppId,'', dbo_tblPatCountryApplication.InvId,
'Add', dbo_tblpatinvention.disclosurestatus .......
INTO StagingTable
FROM dbo_tblPatInvention
INNER JOIN dbo_tblPatCountryApplication
ON dbo_tblPatInvention.InvId = dbo_tblPatCountryApplication.InvId;
If you want to insert them in a specific order then use try using a sub-query in the from clause:
SELECT *
INTO StagingTable
FROM
(
SELECT dbo_tblPatCountryApplication.AppId, '', dbo_tblPatCountryApplication.InvId,
'Add', dbo_tblpatinvention.disclosurestatus .......
FROM dbo_tblPatInvention
INNER JOIN dbo_tblPatCountryApplication ON
dbo_tblPatInvention.InvId = dbo_tblPatCountryApplication.InvId
order by dbo_tblpatcountryapplication.invid
) a;
Try
INSERT INTO stagingtable (AppId, ...)
SELECT ... --your select goes here
I wish to write two nested queries of create and select statements. My motive is to
create a new table which includes columns and entries from two other tables.
I wrote a query but it is giving me an error.
create table table_3(select * from table_1,table_2)
For SQL Server you can use:
SELECT *
INTO table_3
FROM table_1, table_2
If you want to join the two tables based on some key then:
SELECT *
INTO table_3
FROM table_1 JOIN table_2 on table_1.ID = table_2.FKID
You may see: SQL SERVER – CTAS – Create Table As SELECT – What is CTAS?
This can be used to create another table of same type
CREATE TABLE new_table
AS (SELECT * FROM old_table);
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.