Hi I am trying to create a query for SQLite which has a variable part in it. By variable I mean that a certain part within the string can possibly contain a variable but also an empy value
I tried this but I am not sure whether this works.
SELECT * FROM table WHERE attr LIKE 'ABC% %DEF'
Adding onto my comment, check the below code to test your values.
SELECT CASE WHEN 'ABC G DEF' LIKE 'ABC%DEF'
THEN 1
ELSE 0 END as test_space,
CASE WHEN 'ABCGGGDEF' LIKE 'ABC%DEF'
THEN 1
ELSE 0 END AS test_all
Related
I would like to display Unique numbers dynamically. I have tried below code for the same but same number is displaying all the times.
DECLARE
a NUMBER;
BEGIN
FOR i IN 1 .. 3 LOOP
DBMS_OUTPUT.PUT_LINE(&a);
END LOOP;
END;
the above code will ask me for "a" value three times, if i pass 1,2,3 as parameters then it should display 1,2,3 but this code is displaying first(1) value three time as 1,1,1.
Could you please help me to get the required output like 1,2,3
You can't really create an interactive program in just PL/SQL. When you put &a in the PL/SQL and run it in a tool like SQL Developer, it prompts you once for a value for a before it runs the code, using the value you typed instead of the substitution variable a.
You want to print i and not a. Also the ampersand in front of the a means you will be prompted to enter a value for a.
I have a table of records that has two logical flags, holdn and holdl. I want to loop through this table with 3 different criteria.
Either flag is TRUE - We want to see everything that is on hold
Flag holdl is TRUE - We only want see items that are on hold for this one reason
Flag holdn is TRUE - We only want to see items that are on hold for this other reason.
I cannot figure out how to dynamically change the for each loop based on this. What I have tried so far is to set the value of a variable based on these conditions and then use the content of the variable as one of the where parameters. This does not work as Progress complains that there is a data mismatch. The variable is a string, the flags are logical, so that does make sense. See sample code below. This is a snippet of the actual code with the the table name changed. The which-hold, order-from, etc variables are defined and set in a different module which calls this one.
DEFINE VARIABLE which-hold# AS CHARACTER FORMAT "x(30)" NO-UNDO.
CASE which-hold:
WHEN "B" THEN which-hold# = "(widget.holdn or widget.holdl)".
WHEN "L" THEN which-hold# = "widget.holdl".
WHEN "N" THEN which-hold# = "widget.holdn".
END CASE.
for each widget where which-hold# and
widget.order-no >= order-from and widget.order-no <= order-thru and
widget.line-no >= line-from and widget.line-no <= line-thru and
widget.joint-no >= joint-from and widget.joint-no <= joint-thru
no-lock:
A bunch of code to make a nice report with the retrieved records...
end.
Self taught Progress programmer here, who has inherited a huge, poorly documented application. Please be gentle.
If you would prefer not to deal with handles a semi-dynamic approach is also possible:
define variable i as integer no-undo.
define query q for customer.
do while true:
update i.
case i:
when 0 then quit.
when 1 then open query q for each customer no-lock where custNum >= 1000.
when 2 then open query q for each customer no-lock where state = "nh".
otherwise open query q for each customer no-lock where name begins "u".
end.
do while true with frame a:
get next q.
if not available customer then leave.
display custNum name state with frame a 10 down.
down with frame a.
end.
close query q.
end.
What you want is actually a dynamic query. I'll get to it at the end, but first I'd like to explain why you won't be able to try and substitute the field name in the which-hold# variable: because the query is evaluated at compile time. And this is what it reads (supposing which-hold# has a value of widget.holdn
FOR EACH widget where "widget-holdn" (...)
And that does not evaluate to TRUE or FALSE. So what, you ask? Well, that is the key here. Every condition needs to evaluate to true or false, so you'd be more in luck if you try
for each widget where (if widget-hold# = 'widget.holdn' then widget.holdn = true else TRUE) (...)
Again, notice the condition will exist if widget-hold# has the value I want, otherwise it doesn't filter on this at all.
So you can just code the way I showed (for each of the conditions you have) and it should work fine.
BUT let me suggest a dynamic query instead.
You need to have:
DEFINE VARIABLE hQuery AS HANDLE NO-UNDO.
CREATE QUERY hQuery.
hQuery:SET-BUFFERS(BUFFER widget:HANDLE).
hQuery:QUERY-PREPARE('<THIS IS THE CORE>').
hQuery:QUERY-OPEN().
DO WHILE hQuery:GET-NEXT():
A bunch of code to make a nice report with the retrieved records...
END.
So in the core you have a string that corresponds to your for each the way you want it to look. So it should be for example (store this in a variable, or assemble it inside the query prepare, it doesn't matter):
'FOR EACH widget NO-LOCK WHERE ' +
(if which-hold = 'B' then 'widget.holdn = true and widget.holdl = true'
else if which-hold = 'L' then 'widget-holdl = true'
else /* N */ 'widget-holdn = true').
Remember I said your query is evaluated at compile time? Well, just so you know, dynamic queries on the other end are evaluated at run time, so be prepared for errors to pop up only when you run. Another thing I should mention is dynamic queries are slower than static ones, so please evaluate and choose your poison :)
This should be what you need. Please let me know if it's helpful or any questions remain.
I made a stupid mistake and created a column like this:
CREATE TABLE mytable (mycol INTEGER, ...)
As you can see, I forgot to define a default value like "DEFAULT 0".
In my code, I need to raise the value in "mycol" by 1.
I was baffled when I found out that this code didn't have any effect.
UPDATE mytable SET mycol=(mycol+1)
The column value stays as it is. In my case "EMPTY" (=no value at all).
I would like to avoid re-creating the table if possible.
I would like to ask if there is any easy way to fix this in the SQL statement so that an EMPTY value is seen as 0 so that
UPDATE mytable SET mycol=(mycol+1)
on a column value of EMPTY would finally produce the new column value of 1.
You can use such as below if your column has null value:
UPDATE mytable SET mycol= ifnull(mycol,0)+1
I'm producing a report in Crystal Reports where the column order must match the order that they're displayed in in the SSDBGrid in VB6.
To do this, I decided it was best to loop over each column in the grid, and call a function to set the parameter field values to the correct heading (so, column 0's caption would be the value for parameter field #Col1, etc)
Anyway, the code I have for this is
Dim c As Column
Dim cName As String
For Each c In FShow_All_Accounts.grd_accounts.Columns
cName = "#Col" & c.ListIndex
Call setColumnHeaders(c.Index)
crxReport.ParameterFields.GetItemByName(cName).AddCurrentValue ("f")
Next
The problem is that first of all, setting the type of c to Column and looping over each c in grd_accounts seems to be incorrect - grd_accounts is an SSDBGrid, and secondly, it errors when trying to return the index.
So, my question(s):
What is the correct way to loop over each column in an SSDBGrid?
Secondly, how would I then get the column index for the correct column, to pass into the function?
The answer is actually more simple than you're imagining it to be. Your code is very nearly there.
Dim c As Column
Dim i As String
Dim cname As String
i = 0
For Each c in grd_accounts.Columns
i = i + 1
cName = "#Col" & i
crxReport.ParameterFields.GetItemByName(cName).AddCurrentValue (c.Caption)
Next
No need for the helper function. This will iterate over each column, set cName to be "#Col" and the value of i (Also the column number), and therefore that parameter field in the report will be captioned with that columns caption.
I have a query which looks something like below which aim is to see if a two letter code exists in a string. If it does, set a column to yes, if it doesnt set a column to no
SELECT ID,
case when Table_a.item LIKE ANY ('%AA%','%AB%','%AC%','%AD%','%AE%','%FF%',' %GG%','%HR%','%TR%','%ST%','%VL%') THEN 'YES' else 'NO' end AS foo,
item
FROM Table_a
Unfortunately its causing rows to appear twice
ID foo item
112 yes AA-FF-TT-RR
112 no AA-FF-TT-RR
Does anyone know why.
Am i misusing the LIKE ANY function
We are not on Teradata 14 yet
Thank you for your time