WHILE LOOP AS FOR LOOP
its possible?
For each id in (SELECT * FROM table)
INSERT INTO table2(id,fk,nombre)
values(1,id,'xxx');
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ISO
7/29/2015 1:58:07 PM
comp.databases.ms-sqlserver
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Jessica Gonz�lez (jess.rgm@gmail.com) writes:
> its possible?
>
> For each id in (SELECT * FROM table)
> INSERT INTO table2(id,fk,nombre)
> values(1,id,'xxx');
>
So in SQL, you don't normally code the loops explicitly - the loops are
hidden on the inside. Logically, it is an operation of a set.
INSERT table(id, fk, nombre)
SELECT 1, id, 'xxx'
FROM table
--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
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Erland
7/29/2015 2:04:52 PM
thanks.. but
SET IDENTITY_INSERT table ON;
INSERT INTO table(pk,activo,permiso,rol)
SELECT IDENT_CURRENT('table')+1,'S',id, 1
FROM table2
return error
Violation of PRIMARY KEY constraint 'PK__table__3213E83F2B947552'. Cannot insert duplicate key in object 'table'. The duplicate key value is (6).
only 'id' i need get from table2
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ISO
7/29/2015 2:31:23 PM
Jessica Gonz�lez (jess.rgm@gmail.com) writes:
> thanks.. but
>
> SET IDENTITY_INSERT table ON;
> INSERT INTO table(pk,activo,permiso,rol)
> SELECT IDENT_CURRENT('table')+1,'S',id, 1
> FROM table2
>
>
> return error
>
> Violation of PRIMARY KEY constraint 'PK__table__3213E83F2B947552'.
> Cannot insert duplicate key in object 'table'. The duplicate key value
> is (6).
Why do you fiddle with IDENTITY_INSERT ON? That is an option you rarely have
any reason to play with. And IDENT_CURRENT you have even more rare reason to
touch. That is not a particularly useful function.
If you have made the column an IDENTITY column, you should not assign the
values explicitly. And vice versa: if you want to be able to specify the
values explicitly, you sould not use IDENTITY.
--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
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Erland
7/29/2015 3:44:21 PM
On Wednesday, 29 July 2015 16:45:58 UTC+1, Erland Sommarskog wrote:
> Jessica Gonz=E1lez (jess.rgm@gmail.com) writes:
> > thanks.. but
> >=20
> > SET IDENTITY_INSERT table ON;
> > INSERT INTO table(pk,activo,permiso,rol)=20
> > SELECT IDENT_CURRENT('table')+1,'S',id, 1
> > FROM table2
> >=20
> >=20
> > return error =20
> >=20
> > Violation of PRIMARY KEY constraint 'PK__table__3213E83F2B947552'.
> > Cannot insert duplicate key in object 'table'. The duplicate key value
> > is (6).=20
>=20
> Why do you fiddle with IDENTITY_INSERT ON? That is an option you rarely h=
ave=20
> any reason to play with. And IDENT_CURRENT you have even more rare reason=
to=20
> touch. That is not a particularly useful function.
>=20
> If you have made the column an IDENTITY column, you should not assign the=
=20
> values explicitly. And vice versa: if you want to be able to specify the=
=20
> values explicitly, you sould not use IDENTITY.
Of course maybe you didn't make the column IDENTITY,
some other idiot did.
And maybe some idiot boss says that you have to assign
it explicitly.
Or, you just changed your mind.
But the point is that /usually/ you'd do this:
INSERT INTO table(activo,permiso,rol)=20
SELECT 'S',id, 1=20
FROM table2=20
and the identity column gets a key value automatically.
A different case to override it is if you want the=20
key in table 1 to hold the same value as the key=20
in table 2. Sometimes you have to do a thing=20
like that. But then you will just insert using the=20
key column name from table 2, which has a different=20
value in each row. =20
SET IDENTITY_INSERT table ON;=20
INSERT INTO table(pk,activo,permiso,rol)=20
SELECT pk2,'S',id, 1=20
FROM table2;
SET IDENTITY_INSERT table OFF;=20
If you do want to write a loop in Transact SQL
then a conventional way to do it is to use a "cursor",
an object that can fetch one table row at a time.
But this is not popular.
An ordinary cursor needs to be uniquely named,=20
created, started (OPEN), stopped (CLOSE), and=20
disposed of (DEALLOCATE) in the correct order,=20
which is tricky. So I like to use a "cursor=20
variable"; when the variable ceases to exist,=20
so does its cursor. But some keywords don't work
with the cursor variable - STATIC works but=20
INSENSITIVE doesn't, I found recently.
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rja
7/29/2015 5:03:49 PM
Your mindset is wrong. SQL is a declarative language and does not use proce= dural constructs. Things happen "all at once" in whole sets, not in sequent= ial steps. This means we have no loops. A classic book on this topic is Pet= er Henderson's FUNCTIONAL PROGRAMMING.
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CELKO
8/15/2015 12:54:12 AM
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try to make my triple nested loop working. My code would be: c = 4 y1 = [] m1 = [] std1 = [] while c <24: c = c + 1 a = [] f.seek(0,0) for columns in ( raw.strip().split() for raw in f ): a.append(columns[c]) x = np.array(a, float) not_nan = np.logical_not(np.isnan(x)) indices = np.arange(len(x)) interp = interp1d(indices[not_nan], x[not_nan], kind = 'nearest') p = interp(indices) N = len(p) dt = 900.0 #Time step (seconds) fs = 1./dt #Sampling frequency KA,PSD = oned_Fourierspectrum(p,dt) # Call Song's 1D FS function time_axis = np.linspace(0.0,N,num = N,endpoint = False)*15/(60*24) plot_freq = 24*3600.*KA #Convert to cycles per day plot_period = 1.0/plot_freq # convert to days/cycle fpsd = plot_freq*PSD d = -1 while d <335: d = d + 1 y = fpsd[d] y1 = y1 + [y] m = np.mean(y1) m1 = m1 + [m] print m1 -------------------------------------------------------------------------------- My purpose is make a list of [mean(fpsd[0]), mean(fpsd[1]), mean(fpsd[2]).. mean(fpsd[335])]. Each y1 would be the list of fpsd[d]. I check it is working pretty well before second while l...
loops in loops= superloops
I have this huge loop in matlab, which of course asks a lot of computation time. I can't find another way because i need the differences between the steps in Q, and also in my formula, but I'm not a genius with matlab. can anyone give me advice on how to remove my loops? Thanks Adinda The loop: Hms=zeros(nx,ny,nz,3); Hmsnk=zeros(nx,ny,nz); gradHms=zeros(nx,ny,nz,3,6); %for loop with calculation of the magnetostatic field and its derivative for i=1:nx for j=1:ny for s=1:nz for k=1:nx for l=1:ny for m=1:nz ...
nested loops only loop once
I am using two while loops that are nested. The first loop (post name) returns the full column of results, but the second (post modified) only returns the first row of the column. Is there another way I could write this to get both loops to complete fully? I am using the two while loops to pull data from different tables, and insert that data into a list that has html code surrounding each loop. while ($url = mysql_fetch_array($urls, MYSQL_ASSOC)) { $pn = $url['post_name']; while ($date = mysql_fetch_array($lmdate, MYSQL_ASSOC)) { $lm = $date['post_modified']; ...
conditional loops (while loops)
I am using a while loop to check a digital input. I would like to send the value to a true or false box to check another digital input. The problem is that the while loop is running continuously but not giving anything out through the connection. I am looking for something like "if this do that conditional". Is there a way to set this up? Hello! The =93if this, do that conditional=94 tools in LabVIEW are the Select function (All Functions >> Comparison subpalette) and the Case Structure (All Functions >> Structures subpalette), depending on the complexity of what you wa...
while-loops nested in while-loop
Hi! I'm new to labview and I've got some problems. I want to program a control for a testing facility. therefore I want to program several while-loops nested in each other, according to a designed Nassi-Shneiderman-diagram. So if the stop condition for an inner while loop is true (e.g. measure device mistake), the program should jump out of that while loop in the next outer while-loop. is that possible? Thank you right now! Yes it is possible When you stop the inner loop, from inside the inner loop, just wire/pass an appropriate stop condition ( stop if tr...
Loop within a loop ???
Hi, I'm having trouble copying table data to new records. I have two tables as follows: *** Specifications (Table) specification_ID (field) LINKED product_ID (field) specification_header (field) ________________________________________ *** Specification_detail (Table) specification_detail_ID (field) specification_detail_text (field) specification_ID (field) LINKED specification_ID in this table is linked to specification_ID in Specifications. ________________________________________ On a form, related by product_ID, 'Specifications' fills a subform, no problem. When you cli...
Loop-Loop Calculation
Hi i have one VI in that i want to do Loop to Loop calculation. In my VI first the inner loop have to execute first . Loop-Loop calc.vi: http://forums.ni.com/attachments/ni/170/302256/1/Loop-Loop calc.vi I think you should explain better what you wean by "loop to loop calculation". What are you trying to accomplish? ...
While loop VS for loop
I am enabling the index and getting the values inside both for loop and while loop.Which one do you guys think is efficient and a proper coding style.I maybe wrong but i feel while loop to be much faster than for loop.Is that true? rpr wrote:i feel while loop to be much faster than for loop.Is that true? No, they both run at basically the same speed given the same conditions. If anything, the while loop will run a bit slower because it has a condition to evaluate with every iteration. The basic rule is simple - you use a for loop if you want to run a known number of times. Other...
For loop vs While loop
Hi all, For any counting operation what is the advantage of a while loop over a for loop. Internally how is it implemented which results in this advantage. Does it matter in applications where timing is very important like in embedded real time systems. Any inputs on the same are highly appreciated. Thanks and Regards, Aru On Mon, 24 Nov 2008 18:29:41 -0800 (PST), aruna.mysore@gmail.com wrote in comp.programming: > Hi all, > > For any counting operation what is the advantage of a while loop over > a for loop. Internally how is it Each of them is better than the other. > i...
stop an if loop in a for loop
Hello, I try to find a way to stop an if loop inside of a for loop but keep the for loop going. I tried to use "return" and "break" but they stop the for loop too. Bellow is a simple script to explain what I mean. Using "return", it stops the loop when z = 2 but I would like to find a way to keep the for loop going until z = 3. i = 1; for z = 1:3 i = i+1; if i ==3 return % Stop the if loop else display('Cant do it') end end Thank you for you help Benoit "Benoit " <igneb@iastate.edu> writes: > Hell...
while loop inside a for loop
Hi, can someone please tell me why "time" (t) is not updated correctly within the while loop? Please run this small code in your machine and you'll know what I'm taking about. What I want is: for t=1 run the "while loop" until iq<=(numberc-1) then t=2 run the "while loop" again until iq<=(numberc-1), and so on. Basically, this code runs through all the nonzero elements of A and attempts to divide them individually into two, once a certain time has passed. Please feel free to ask for clarifications. Many thanks in advance. A=[0 0 0 0 0 0 ...
Web resources about - WHILE LOOP AS FOR LOOP - comp.databases.ms-sqlserver
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