I am looking to extract Sybase datatype for all the columns in a table. When I try to achieve this using $sth->{TYPE}, I get a numeric version of the datatype (i.e. instead of sybase datatype varchar, I get 0).
From the DBD::Sybase documentation, I noticed that SYBTYPE attribute of syb_describe function might be able to produce what I am looking for. But it seems that my understanding is not proper. SYBTYPE also prints datatype in numeric form only.
Is there any way to fetch the textual representation of actual Sybase datatype (instead of the number)?
It sounds like you wish to reverse engineer the create table definition. Here is an SQL script you can use for Sybase or SQL Server tables.
select c.name,
"type(size)"=case
when t.name in ("char", "varchar") then
t.name + "(" + rtrim(convert(char(3), c.length)) + ")"
else t.name
end,
"null"=case
when convert(bit, (c.status & 8)) = 0 then "NOT NULL"
else "NULL"
end
from syscolumns c, systypes t
where c.id = object_id("my_table_name")
and c.usertype *= t.usertype
order by c.colid
go
Note: This could still be edited with a nawk script to create a real SQL schema file.
The nawk script would strip the header, add "create table my_table_name", add commas, strip the footer and add a "go".
Good SQL, good night!
I found a workaround (Note: This does not answer the question though):
What I did was simply joined the sysobjects, systypes and syscolumns system tables.
Related
I'm using a PostgreSQL with a Go driver. Sometimes I need to query not existing fields, just to check - maybe something exists in a DB. Before querying I can't tell whether that field exists. Example:
where size=10 or length=10
By default I get an error column "length" does not exist, however, the size column could exist and I could get some results.
Is it possible to handle such cases to return what is possible?
EDIT:
Yes, I could get all the existing columns first. But the initial queries can be rather complex and not created by me directly, I can only modify them.
That means the query can be simple like the previous example and can be much more complex like this:
WHERE size=10 OR (length=10 AND n='example') OR (c BETWEEN 1 and 5 AND p='Mars')
If missing columns are length and c - does that mean I have to parse the SQL, split it by OR (or other operators), check every part of the query, then remove any part with missing columns - and in the end to generate a new SQL query?
Any easier way?
I would try to check within information schema first
"select column_name from INFORMATION_SCHEMA.COLUMNS where table_name ='table_name';"
And then based on result do query
Why don't you get a list of columns that are in the table first? Like this
select column_name
from information_schema.columns
where table_name = 'table_name' and (column_name = 'size' or column_name = 'length');
The result will be the columns that exist.
There is no way to do what you want, except for constructing an SQL string from the list of available columns, which can be got by querying information_schema.columns.
SQL statements are parsed before they are executed, and there is no conditional compilation or no short-circuiting, so you get an error if a non-existing column is referenced.
What's your method of quickly viewing results of such statements?
SELECT * FROM CustInvoiceJour`
JOIN CustInvoiceTrans WHERE CustInvoiceJour.InvoiceId == CustInvoiceTrans.InvoiceId`
WHERE CustInvoiceTrans.ItemId == 'MBIIRKT0014'
I'm looking for something like table explorer, but supporting joins.
If this is just for quick data checks, I just usually use info(strFmt(...)); statements to output what I need to see.
Another way, if you're stronger in SQL is to actually use SQL. You can use the keywords generateonly and forceLiterals to generate the SQL statement and force literal values.
Here is your AX SQL statement rewritten:
SELECT generateonly forceLiterals * FROM CustInvoiceJour
JOIN CustInvoiceTrans
WHERE CustInvoiceJour.InvoiceId == CustInvoiceTrans.InvoiceId &&
CustInvoiceTrans.ItemId == 'MBIIRKT0014';
info(CustInvoiceJour.getSQLStatement());
Then you can run that SQL in SQL and do what you need.
Your X++ select has two WHERE's in it and is malformed, but I fixed it.
If you need to make joins In my case I create a simple View object.
Table CustInvoiceJour principal and then joins to CustInvoiceTrans
Views located in AOT/Data Dictionary/Views
The software I used created tables in postgres with Capitalizations, and I know that postgres and caps are a pain to deal with. I am using a multi-table query but they have Caps and I am not sure how to get the query down correctly to make it work.
I have two databases TBLS and DBS. I want to get the column TBL_NAME where the two DB_ID's are the same.
Here is what I thought might work:
select '"t.TBL_NAME"' from "TBLS" t, "DBS" d where '"t.DB_ID"'='"d.DB_ID"';
Any way I try and place the " or ' I can't seem to get the query to work correctly.
"tablename"."columnname"
See the manual on SQL syntax.
'"X.COL"' is a string literal with content string "X.COL".
"X.COL" is a single unqualified identifier for the object named X.COL. Yes, table, column, etc names can have a . in them.
"X"."COL" is a qualified identifier for COL in object X. Depending on context it can mean "the table COL in schema X", "the column COL in table X", etc. This is the one you want.
Wondering if there is a way to query a SQL Server database and somehow format columns to omit commas in the data if there is any.
Reason for asking is I have 10000+ records and through out the data the varchar have data like 3,25% and other 1%.
I'd prefer not to alter the data in the original table thus asking if a select with other functions would do the trick.
I have thought about selecting all the data into a temp table and stripping the commas but that is a lot of work for every time I do the query.
Any info or if its is possible please reply.
Take a look at the REPLACE function:
SELECT REPLACE(YourColumn, ',', '')
FROM YourTable
Use SQL REPLACE :
REPLACE(YourField,',','')
I have a complex query that requires a rank in it. I've learned that the standard way of doing that is by using the technique found on this page: http://thinkdiff.net/mysql/how-to-get-rank-using-mysql-query/. I'm using Infobright as the back end and it doesn't work quite as expected. That is, while a standard MySQL engine would show the rank as 1, 2, 3, 4, etc... Brighthouse (Infobright's engine) would return 1, 1, 1, 1, etc.... So I came up with a strategy of setting a variable, a function, and then execute it in the query. Here's a proof of concept query that does just that:
SET #rank = 0;
DROP FUNCTION IF EXISTS __GetRank;
DELIMITER $$
CREATE FUNCTION __GetRank() RETURNS INT
BEGIN
SET #rank = #rank + 1;
return #rank;
END$$
DELIMITER ;
select __GetRank() AS rank, id from accounts;
I then copied and pasted the function into Jasper Report's iReport and then compiled my report. After executing it, I get syntax errors. So I thought that perhaps the ; was throwing it off. So at the top of the query, I put in DELIMITER ;. This did not work either.
Is what I'm wanting to do even possible? If so, how? And if there's an Infobright way of getting a rank without writing a function, I'd be open to that too.
Infobright does not support functions.
From the site: http://www.infobright.org/forums/viewthread/1871/#7485
Indeed, IB supports stored procedures, but does not support stored functions nor user defined functions.
select if(#rank is null,#rank:= 0,#rank:= #rank +1) as rank, id from accounts
Does not work, because you cannot write to #vars in queries.
This:
SELECT
(SELECT COUNT(*)
FROM mytable t1
WHERE t1.rankedcolumn > t2.rankedcolumn) AS rank,
t2.rankedcolumn
FROM mytable t2 WHERE ...;
will work, but is very slow of course.
Disclaimer, not my code, but Jakub Wroblewski's (Infobright founder)
Hope this helps...
Here's how I solved this. I had my server side program execute a mysql script. I then took the output and converted it to a CSV. I then used this as the input data for my report. A little convoluted, but it works.