I have a database table "create table t (s varchar, i int)" with 100 records.
When I want to sum all 'i' fields, I invoke something like "select sum(i) from t". Is there a way to concatenate the 's' fields? (select concatenate(s) from t)
In any sql dialect?
In any sql dialect?
There isn't an ANSI SQL specified way to do this across all SQL dialects. If you want specific solutions for a particular DBMS, then sure, some have a ready made solution, and others have generalized solutions that are more complicated.
e.g.
Oracle = WM_CONCAT
MySQL = GROUP_CONCAT
SQL Server = UDF / FOR XML PATH('') / recursive CTE
You need a question for each RDBMS you need the solution for, but you will find duplicate questions for each case already on StackOverflow.
Related
I am trying to find a way to do SQL column aliasing based on a query. I'm well aware that the SQL below is not valid, it's just provided as an example of what I wish did worked. Can anyone think of a way of doing this?
select col_001_name AS (select col_001_name FROM public.intparms WHERE base_tbl_name = '130')
FROM public.intparms WHERE base_tbl_name = '130';
I need to re-assign all SortID's, starting from 1 until MAX (SortID) from a subset of records of table Beleg, using SQL-92, after one of the SortID's has changed (for example from 444 to 444.1). I have tried several ways (for example SET #a:=0; UPDATE table SET field=#a:=#a+1 WHERE whatever='whatever' ORDER BY field2), but it didn't work, as these solutions all need a special kind of SQL, like SQLServer or Oracle, etc.
The SQL that I use is SQL-92, implemented in FileMaker (INSERT and UPDATE are available, though, but nothing fancy).
Thanks for any hint!
Gary
From what I know, SQL-92 is a standard and not a language. So you can say you are using T-SQL, which is mostly SQL-92 compliant, but you can't say I program SQL Server in SQL-92. The same applies to FileMaker.
I suppose you are trying to update your table through ODBC? The Update statement looks OK, but there are no variables if FileMaker SQL (and I am not sure using a variable inside query will give you result you expect, I think you will set SortId in every row to 1). You are thinking about doing something like Window functions with row() in TSQL, but I do not think this functionality is available.
The easiest solution is to use FileMaker, resetting the numbering for a column is really a trivial task which takes seconds. Do you need help with this?
Edit:
I was referring to TSQL functions rank() and row_number(), there is no row() function in TSQL
I finally got the answer from Ziggy Crueltyfree Zeitgeister on the Database Administrators copy of my question.
He suggested to break this down into multiple steps using a temporary table to store the results:
CREATE TABLE sorting (sid numeric(10,10), rn int);
INSERT INTO sorting (sid, rn)
SELECT SortID, RecordNumber FROM Beleg
WHERE Year ( Valuta ) = 2016
AND Ursprungskonto = 1210
ORDER BY SortID;
UPDATE Beleg SET SortID = (SELECT rn FROM sorting WHERE sid=Beleg.SortID)
WHERE Year ( Valuta ) = 2016
AND Ursprungskonto = 1210;
DROP TABLE sorting;
Of course! I just keep the table definition in Filemaker (let the type coercion be done by Filemaker this way), and filling and deleting from it with my function: RenumberSortID ().
We have an application which indexes data using user-written SQL statements. We place those statements within parenthesis so we can limit that query to a certain criteria. For example:
select * from (select F_Name from table_1)q where ID > 25
Though we have discovered that this format does not function using a Sybase database. Reporting a syntax error around the parenthesis. I've tried playing around on a test instance but haven't been able to find a way to achieve this result. I'm not directly involved in the development and my SQL knowledge is limited. I'm assuming the 'q' is to give the subresult an alias for the application to use.
Does Sybase have a specific syntax? If so, how could this query be adapted for it?
Thanks in advance.
Sybase ASE is case sensitive w.r.t. all identifiers and the query shall work:
as per #HannoBinder query :
select id from ... is not the same as select ID from... so make sure of the case.
Also make sure that the column ID is returned by the Q query in order to be used in where clause .
If the table and column names are in Upper case the following query shall work:
select * from (select F_NAME, ID from TABLE_1) Q where ID > 25
I have rows which contains HTML tags. e.g.
<b>Abc</b> <strong>Bca</strong>
So I need to cut it out. As I suggest I need to find something like '%<%>%' and make a REPLACE to ''.
How can I do it? Interested for both solutions - MS SQL & Oracle also.
Assuming table is called yourtable and field is called htmltag.
In SQL Server:
SELECT
SUBSTRING(substring(htmltag,charindex('>',htmltag)+1,250),0,CHARINDEX('<',
substring(htmltag,charindex('>',htmltag)+1 ,250),0))
FROM yourtable
SQL FIDDLE
In Oracle
SELECT regexp_replace(htmltag, '<[^>]+>', '') htmltag
FROM yourtable
SQL FIDDLE
I need a common select statement that returns a fixed value / row without the need of tables, which has to work with both Oracle & Sql Server.
eg for Oracle I know I can use:
select 'O' AS INDICATOR from DUAL;
But this won't work on Sql Server.
Can this be done with the same SQL on both Oracle & SQL Server?
AFAIK, you'll need different queries, unless you can find a table that exists both on the SQL Server and on the Oracle Server.
Oracle uses the DUAL table for dummy queries, while the syntax to just select a constant on SQL server is a bit simpler:
select 'O' as Indicator
will return a one-row recordset.
P.S. If you intend to write just standard SQL and have it work on both SQL Server and Oracle, note that there are lots and lots of differences, even if you do not use database-side code (stored procedures and functions).
Off the top of my head, some things that are different:
Case statement syntax
NVL vs IsNull
Null sorting behaviour
Data conversion functions
String manipulation functions
etc, etc.
You can't select data in Oracle without from statement. So you need to have a table in Oracle (common practice is to use standard table - Dual). The best solution if you really need to run same query on both database servers is to create Dual table with only one row in MS SQL. But really it's better to use different queries for different servers (maybe via some abstraction layer).
Use a common table expression (CTE) e.g.
WITH D (INDICATOR)
AS
(
SELECT *
FROM (
VALUES ('O')
) T (c1)
)
SELECT INDICATOR
FROM D;
Or more simply in line:
SELECT *
FROM (
VALUES ('O')
) D (INDICATOR)
You can create the DUAL table in SQL Server:
CREATE TABLE DUAL (DUMMY NVARCHAR(1) NOT NULL);
INSERT INTO DUAL VALUES ('X');
and then use the same query as in Oracle:
select 'O' AS INDICATOR from DUAL;