I am new to DB2 and learning.
We have below query trying join table ,but it is returing me an error, can someone please help?
SELECT "Q.WRITETIME", "Q.Queue_Name", "Q.Current_Depth", "S.Oldest_Message_Age", "Q.Percent_Full", "Q.Messages_Read_per_Second", "Q.Messages_Put_per_Second", "Q.Maximum_Depth"
FROM "ITMUSER"."Queue_Long_Term_History" Q
LEFT OUTER JOIN "ITMUSER"."Queue_Status" S
ON
"Q.Queue_Name" = "S.Queue_Name"
where "Queue_Name"='PHX.IIB.WAS.DATAREQ.QL'
ORDER BY Q."WRITETIME";
Can someone please help me with this query?
I am below error codes when playing:
DB2 SQL Error: SQLCODE=-206, SQLSTATE=42703,
DB2 SQL Error: SQLCODE=-104, SQLSTATE=42601,
You've got an invalid column name somewhere...
Do you really need quoted names?
DB2 by default is not case sensitive for schemas, tables or column names.
mycolumn is the same as MYCOLUMN
If you really need quoted names, then be aware that it has to be an exact match.
"MyColumn" is NOT the same as "Mycolumn"
There seems to be issues with your quoting. Each object needs to be quoted separately: "SCHEMA"."TABLE"."COLUMN"
Here's the revised query, which was also missing a table qualifier in the WHERE clause. Also, as Charles mentioned, quoted identifiers are case-sensitive.
SELECT "Q"."WRITETIME", "Q"."Queue_Name", "Q"."Current_Depth",
"S"."Oldest_Message_Age", "Q"."Percent_Full",
"Q"."Messages_Read_per_Second",
"Q"."Messages_Put_per_Second", "Q"."Maximum_Depth"
FROM "ITMUSER"."Queue_Long_Term_History" Q
LEFT OUTER JOIN "ITMUSER"."Queue_Status" S
ON "Q"."Queue_Name" = "S"."Queue_Name"
WHERE "Q"."Queue_Name"='PHX.IIB.WAS.DATAREQ.QL'
ORDER BY "Q"."WRITETIME"
Related
%sql select Name_of_School, Safety_Score from SCHOOLS where \
Safety_Score= (select MAX(Safety_Score) from SCHOOLS)
i am trying to execute this query i got the message.
ibm_db_sa://rbm44299:***#dashdb-txn-sbox-yp-lon02-04.services.eu-gb.bluemix.net:50000/BLUDB
(ibm_db_dbi.ProgrammingError) ibm_db_dbi::ProgrammingError: SQLNumResultCols failed: [IBM][CLI Driver][DB2/LINUXX8664] SQL0206N "SAFETY_SCORE" is not valid in the context where it is used. SQLSTATE=42703 SQLCODE=-206
[SQL: select Name_of_School, Safety_Score from SCHOOLS where Safety_Score= (select MAX(Safety_Score) from SCHOOLS)]
(Background on this error at: http://sqlalche.me/e/f405)
SQL0206N is this error message https://www.ibm.com/support/knowledgecenter/SSEPGG_11.5.0/com.ibm.db2.luw.messages.sql.doc/com.ibm.db2.luw.messages.sql.doc-gentopic1.html#sql0206n
SQL0206N name is not valid in the context where it is used.
This error can occur in the following cases:
For an INSERT or UPDATE statement, the specified column is not a column of the table, or view that was specified as the object of the insert or update.
For a SELECT or DELETE statement, the specified column is not a column of any of the tables or views identified in a FROM clause in the statement.
among other cases.
I.e. Column SAFETY_SCORE does not exist in your table. Maybe the column is "Safety_Score" or "Safety Score" or some other name.
If the column name is not in UPPER CASE in your table, you will need to surround it in double quotes.
I could fix by using the %%sql structure and the double quotes :
%%sql
select MAX("Safety Score") AS MAX_SAFETY_SCORE from Chicago_SCHOOLS;
I have a local copy of Postgres running, and I'm working on a C# .Net Core 2.1 app using nHibernate as an ORM.
It's started throwing an exception: PostgresException: 42703: column this_.datasetname does not exist
When I copy the SQL and run in pgAdmin I get a similar error.
This is a short version of the SQL which gives the same error:
SELECT this_.datasetName FROM orders this_
ERROR: column this_.datasetname does not exist LINE 1: SELECT
this_.datasetName FROM orders this_
^ HINT: Perhaps you meant to reference the column "this_.datasetName". SQL state: 42703 Character: 8
If I add quotes around the column name (but not around _this. as suggested) it works, but obviously I can't tell nHibernate to do that.
SELECT this_."datasetName" FROM orders this_
The following also works fine:
SELECT "datasetName" FROM orders
Why would it insist on adding the quotes? It never used to.
That's because this column was created with the surrounding double quotes in the first place - this makes the identifier case-sensitive, while by default it isn't. Since the identifier contains mixed case, you are stucked: the identifier needs to be quoted everywhere you use it.
If you look at the definition of the table, you will see something like:
create table orders (
...,
"datasetName" text,
...
)
I would strongly suggest fixing your schema. Quoted identifiers add no value in general, while on the other hand they make things unnecessary complicated. Camel case does not fill well for database identifiers, snake case is better, since case is not meaningful:
create table orders (
...,
dataset_name text,
...
)
i tried to run this query in DB2 ( which includes regex ). I am getting the following error. Can someone help?
Here is the query:
SELECT COUNT(*) FROM TABLE WHERE REGEXP_LIKE(TRIM(FIELD), '[^[:digit:]]')
Support for BOOLEAN data type is new in Db2 11.1.1.1 (i.e. the first Mod Pack + Fix pack for Db2 11.1). If you are only on Db2 11.1.0.0, then you will need to explicitly test the result of your regex function.
SELECT COUNT(*) FROM TABLE
WHERE REGEXP_LIKE(TRIM(FIELD), '[^[:digit:]]') = 1;
I have a PostGIS query where I really need to have nested queries inside PostGIS function calls:
UPDATE raw.geocoding
SET the_geom = ST_Centroid(
ST_Collect(
SELECT the_geom
FROM raw.geocoding
WHERE hash = ((E'0101000020090C000081610F9CC5DC3341EE672E6E723B3241')::varchar),
SELECT the_geom
FROM raw.geocoding
WHERE hash = ((E'0101000020090C00002CF887E0C5DC3341C9E5B2DF2A383241')::varchar)
)
)
WHERE hash = ((E'3e638a27c6c38f05026252f4a0b57b2e')::varchar)
Unfortunately, this doesn't work. I get a syntax error at the beginning of the nested query:
ERROR: syntax error at or near "SELECT"
LINE 4: SELECT the_geom
^
********** Error **********
ERROR: syntax error at or near "SELECT"
SQL state: 42601
Character: 86
Looks like I cannot have a nested query as a PostGIS function parameter?
I've perused through the PostGIS documentation and cannot find any clear guidance for dealing with this.
It appears Postgres has a way of doing variables in pgSQL, but it's unclear to me how this would be pulled off in a standard query. This is a query that will be run tens or hundreds of thousands of times from a C# program. That aside, I could do a pgSQL stored procedure if required; just wanted to make sure there wasn't a simpler alternative first.
In case you were wondering, the query looks messy because it's the result of a npgsql-generated parameterized query. I think it's fair to say that npgsql is being extra-cautious with redundant typing and escaping.
I am running PostGIS 2.0.1, Postgres 9.1.5, and npgsql 2.0.12.
It sounds like you want a scalar subquery, an expression written like (SELECT ....) (note enclosing parentheses) that contains a query returning either zero rows (NULL result) or one field from one row.
You were most of the way there, you just needed the parens:
UPDATE raw.geocoding
SET the_geom = ST_Centroid(
ST_Collect(
(SELECT the_geom
FROM raw.geocoding
WHERE hash = ((E'0101000020090C000081610F9CC5DC3341EE672E6E723B3241')::varchar)),
(SELECT the_geom
FROM raw.geocoding
WHERE hash = ((E'0101000020090C00002CF887E0C5DC3341C9E5B2DF2A383241')::varchar))
)
)
WHERE hash = ((E'3e638a27c6c38f05026252f4a0b57b2e')::varchar)
Note that subqueries can be used in other places too - table returning subqueries can appear in FROM, for example. The PostgreSQL manual teaches about all this, and is well worth a cover-to-cover read.
If you're doing a lot of these updates, you may find it more efficient to formulate the UPDATE as a join using the PostgreSQL extension UPDATE ... FROM ... WHERE rather than running lots of individual UPDATEs over and over. I just wanted to raise the possibility. See from-list in UPDATE
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.