I am trying to select a single column in my data table using raw SQL in a postgresql database from the psql command line. I am getting an error message that says the column does not exist. Then it gives me a hint to use the exact column that I referenced in the select statement. Here is the query:
SELECT insider_app_ownershipdocument.transactionDate FROM insider_app_ownershipdocument;
Here is the error message:
ERROR: column insider_app_ownershipdocument.transactiondate does not exist
SELECT insider_app_ownershipdocument.transactionDate FROM in...
HINT: Perhaps you meant to reference the column "insider_app_ownershipdocument.transactionDate".
I have no idea why this is not working.
(Postgres) SQL converts names automatically to lower case although it support case-sensitive names. So
SELECT insider_app_ownershipdocument.transactionDate FROM insider_app_ownershipdocument;
will be aquivalent to:
SELECT insider_app_ownershipdocument.transactiondate FROM insider_app_ownershipdocument;
You should protect the column name with double quotes to avoid this effect:
SELECT insider_app_ownershipdocument."transactionDate" FROM insider_app_ownershipdocument;
Related
i have a table whose name is like. But whenever i have to select data from like, i was getting this error, i figured it out public.like..but when i try to join two tables
SELECT *
FROM frame
INNER JOIN public.like
ON like.takerId = frame.likeId;
i get this error
ERROR: syntax error at or near "."
LINE 4: ON like.takerId = frame.likeId;
i also use public prefix but it throws
ERROR: column like.takerid does not exist
LINE 4: ON public.like.takerId = frame.likeId;
^
HINT: Perhaps you meant to reference the column "like.takerId".
even if it is saying column like.takerid does not exist , then why it gives me HINT: Perhaps you meant to reference the column "like.takerId". I dont know, i think it is problem with like table name, like is a sql syntax, and it assumes like and a sql syntax and throwing me error. Should I change my table name? Or is there any way to make sql case sensetive or how can i tell sql to ignore like. public.like is not working for joining table.
As like is a reserved keyword, you need to use double quotes for each occurance of it (unless it's prefixed with the schema name as you found out)
SELECT *
FROM frame
JOIN public.like ON "like".takerId = frame.likeId;
Or
SELECT *
FROM frame
JOIN "like" ON "like".takerId = frame.likeId;
Or use an alias
SELECT *
FROM frame f
JOIN "like" l ON l.takerId = f.likeId;
But in the long run you should find a different name for the table that does not require quoting.
You should definitely chose another name for your table. LIKE is a reserved command, and it is considered a bad practice to use it, although possible by using ", e.g.
CREATE TABLE public."like" (id int);
INSERT INTO public."like" VALUES (42);
SELECT * FROM "public.like"
EDIT: As pointed out by #a_horse_with_no_name, specifying a schema in temporary tables won't work (check db<>fiddle), so only the table name should be between double quotes as corrected in the snippet above. For temporary tables just omit the schema:
CREATE TEMPORARY TABLE "like" (id int);
INSERT INTO "like" VALUES (42);
SELECT * FROM "like"
Demo: db<>fiddle
I have multiple tables with very similar schema except one column, which can have different names.
I want to make some complicated calculations using Hive and would like to have one code for all tables with possible parametrisation. For some reasons, I can't parametrise queries using language like Python, Scala etc, so decided to go with pure Hive SQL.
I want to conditionally select appropriate column, but it seems, that Hive evaluates all parts of conditional expression/statement regardless of condition.
What did I wrong?
DROP TABLE IF EXISTS `so_sample`;
CREATE TABLE `so_sample` (
`app_version` string
);
SELECT
if (true, app_version, software_version) AS firmware
FROM so_sample
;
Output:
Error: Error while compiling statement: FAILED: SemanticException [Error 10004]: Line 2:25 Invalid table alias or column reference 'software_version': (possible column names are: app_version) (state=42000,code=10004)
Regards
Pawel
Try to use regex to select the column with different names, for more information see manual and don't forget
set hive.support.quoted.identifiers=none;
In BigQuery I am using the following query:
SELECT
*
FROM
`properati-data-public:properties_mx.properties_sell_201***`
WHERE
_TABLE_SUFFIX BETWEEN '1501'
AND '1810'
Where properati-data-public:properties_mx.properties_sell_201501 is a valid table. When I use the query with multiple tables, I get the following error:
Query Failed
Error: Invalid table name: `properati-data-public:properties_mx.properties_sell_201***`
you should use:
`properati-data-public.properties_mx.properties_sell_20*`
Note:
. vs. :
20* vs. 201***
Also put below as a first line in your query to assure you are in Standard SQL mode
#standardSQL
Is it possible to use
SELECT DB.TABLE.COLUMN from DB.TABLE
in Hive?
I know it's possible to alias DB.TABLE as follows
SELECT T1.COLUMN FROM DB.TABLE AS T1
But, is there any way in Hive to select a column fully qualified by its database and table name, as shown in the first query above? I've done this before in MySQL but I don't know if there's a way to make Hive work this way.
No, that is not possible in Hive, you will get an exception:
SemanticException [Error 10004]: Line 1:7 Invalid table alias or column reference 'DB': (possible column names are: col)
And your second select sentence is valid.
To specify a database, either qualify the table names with database names ("db_name.table_name" starting in Hive 0.7) or issue the USE statement before the query statement (starting in Hive 0.6).
See language manual here: LanguageManual+Select
In my PostgreSQL database I have table that is inside import schema. When I want to get all data from the column I do:
select * from import.master_plan
This query works fine. But when I try to for example get only title column values:
select import.master_plan.title from import.master_plan;
it returns:
ERROR: column master_plan.title does not exist
LINE 1: select import.master_plan.title from import.master_plan;
^
HINT: Perhaps you meant to reference the column "master_plan. title".
I've also tried:
select title from import.master_plan;
but this also not works. I'm using PostgreSQL 10. How can I fix that?
I would suggest that you use a table alias instead:
select mp.title
from import.master_plan mp;
This is much easier to read and to type.
Judging from the error message, though, the name seems to have leading spaces. Something like:
select mp." title"
from import.master_plan mp;
might work. If this is the case, alter the table and rename the column.