I am executing the following query
DELETE FROM List,Tree WHERE List.CatID = Tree.CatID AND List.ID = '1' AND Tree.Cat = '332'
but I run into following error
near ",": syntax error
Correct syntax for delete statement is this
DELETE FROM table_name WHERE somecolumn=somevalue
So you cannot use 2 tables in a single delete query by separating them with a comma..
You need to do something like
DELETE something FROM table_name INNER JOIN...
You can delete only from one table at a time, and you have to rewrite the join as a subquery:
DELETE FROM List
WHERE ID = '1'
AND CatID IN (SELECT CatID
FROM Tree
WHERE Cat = '332')
Related
I am trying to recreate a query that uses a subquery in the left join to get the value of a KPI. I am trying to store that subquery in another table as a string and use dynamic sql to retrieve that string code and insert it into the left join, but I am getting an error:
[5526] SPL2010:E(L27), Variable of CHARACTER type expected in PREPARE or EXECUTE IMMEDIATE statement.
Here is the procedure I am trying to create. In the variable metric_code, the column SQL is a string that contains the sql code.
Create PROCEDURE dyn_sql_test()
BEGIN
DECLARE metric_code VARCHAR(5000);
Set metric_code = (Select SQL_CODE from mytable_with_Sql_code where ID=1234);
BEGIN
set get_value='
SELECT
e.*
,a.value
FROM Metric_table AS e
LEFT JOIN ('||metric_code||') a
on e.id=a.id
WHERE e.ID = 1234;';
EXECUTE IMMEDIATE get_value;
END;
END;
In case it helps, the string I am retrieving for SQL_CODE, which used to go in the Left Join as a subquery looks something like this:
sel id,type,values
from my_values_table
where type='kpi'
In SQL Server, I can use IF conditional structure to execute some statements if a condition is true. According to this and this, there seem to be no such structure in SQLite.
I want to check if a table exist, if it does, do nothing, if not, do a lot of things including creating tables, inserting and deleting data from other tables and updating as well:
CASE WHEN ((SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name = 'TraitsSwap') = 1) THEN
-- 50 lines of code, including CREATE, DROP, INSERT, DELETE and UPDATE statements, with random() in used
ELSE
-- Do nothing
END
Is there anyway I can achieve this? The code includes usage of random() and it requires consistent result (i.e, only random in the first time). I am sorry if this sounds unreasonable, but this is in context of game modding, so I cannot really change the backend code to run separated transaction code.
I think there may be an alternative if there is a function in SQLite that can execute a string/statement block and return a result. For that, I can transform the query into
SELECT CASE WHEN ((SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name = 'TraitsSwap') = 1) THEN
ExecuteCode("Code; RETURN 1;")
ELSE
0
END
I tried
SELECT CASE WHEN ((SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name = 'TraitsSwap') = 1) THEN
SELECT 1;
INSERT INTO Foo(Test) VALUES("");
SELECT "A";
ELSE
SELECT 1;
SELECT 2;
SELECT "A";
END
but it's unsuccessful, the error is
near "SELECT": syntax error: SELECT CASE WHEN ((SELECT COUNT(*) FROM
sqlite_master WHERE type = 'table' AND name = 'TraitsSwap') = 1) THEN
SELECT
I need to have a sqldatasource with the following sql in it.
if #filter = 'departments'
begin
SELECT ISNULL(DocTitle,'') as Name, DocNumber as id, DocUrl+DocName AS link,LastModBy,LastModDate, IsLink
FROM cmc.CMC_Docs d
INNER JOIN CMC.CMC_Doc_Locations as l on l.FamilyID = d.FamilyID
INNER JOIN CMC.CMC_DocFamilies df on df.FamilyID = d.FamilyId
WHERE IsEnabled=1
AND ISNULL(DocName,'') <> ''
AND d.FamilyID IN #dep
ORDER by DocTitle
end
where #dep is something like (2,3)
However when I try to test the query I get an error saying incorrect syntax near #dep.
Any ideas how I need to write this inside of the datasource in order for it to work?
Thanks,
do you need to put this in ()?
ex: select * from product where productid in (1,2,3) works
ex: select * from product where productid in 1,2,3 - does not work
I am having trouble getting a block of pl/sql code to work. In the top of my procedure I get some data from my oracle apex application on what checkboxes are checked. Because the report that contains the checkboxes is generated dynamically I have to loop through the
APEX_APPLICATION.G_F01
list and generate a comma separated string which looks like this
v_list VARCHAR2(255) := (1,3,5,9,10);
I want to then query on that list later and place the v_list on an IN clause like so
SELECT * FROM users
WHERE user_id IN (v_list);
This of course throws an error. My question is what can I convert the v_list to in order to be able to insert it into a IN clause in a query within a pl/sql procedure?
If users is small and user_id doesn't contain commas, you could use:
SELECT * FROM users WHERE ',' || v_list || ',' LIKE '%,'||user_id||',%'
This query is not optimal though because it can't use indexes on user_id.
I advise you to use a pipelined function that returns a table of NUMBER that you can query directly. For example:
CREATE TYPE tab_number IS TABLE OF NUMBER;
/
CREATE OR REPLACE FUNCTION string_to_table_num(p VARCHAR2)
RETURN tab_number
PIPELINED IS
BEGIN
FOR cc IN (SELECT rtrim(regexp_substr(str, '[^,]*,', 1, level), ',') res
FROM (SELECT p || ',' str FROM dual)
CONNECT BY level <= length(str)
- length(replace(str, ',', ''))) LOOP
PIPE ROW(cc.res);
END LOOP;
END;
/
You would then be able to build queries such as:
SELECT *
FROM users
WHERE user_id IN (SELECT *
FROM TABLE(string_to_table_num('1,2,3,4,5'));
You can use XMLTABLE as follows
SELECT * FROM users
WHERE user_id IN (SELECT to_number(column_value) FROM XMLTABLE(v_list));
I have tried to find a solution for that too but never succeeded. You can build the query as a string and then run EXECUTE IMMEDIATE, see http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/dynamic.htm#i14500.
That said, it just occurred to me that the argument of an IN clause can be a sub-select:
SELECT * FROM users
WHERE user_id IN (SELECT something FROM somewhere)
so, is it possible to expose the checkbox values as a stored function? Then you might be able to do something like
SELECT * FROM users
WHERE user_id IN (SELECT my_package.checkbox_func FROM dual)
Personally, i like this approach:
with t as (select 'a,b,c,d,e' str from dual)
--
select val
from t, xmltable('/root/e/text()'
passing xmltype('<root><e>' || replace(t.str,',','</e><e>')|| '</e></root>')
columns val varchar2(10) path '/'
)
Which can be found among other examples in Thread: Split Comma Delimited String Oracle
If you feel like swamping in even more options, visit the OTN plsql forums.
I'm trying to delete the last added entry of a table:
DELETE FROM notes ORDER BY created_at DESC LIMIT 1
This just causes the following error:
near "ORDER": syntax error
Why might I be getting this error? (notes exists and has records in it!)
Try this
DELETE FROM notes WHERE id = (SELECT MAX(id) FROM notes);
delete from notes where created_at = ( select max(created_at) from notes );
Watch out, this will not limit the number of rows deleted. If there are more than one row at max(created_at), this will delete all of them because the subject you specified does not exist (last added entry of a table).