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PL/SQL - Leading zeros

Posted on 2016-11-09
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Last Modified: 2016-11-10
I have a table that I am trying to concatenate the alpha, next_number, suffix, and length fields together with leading zeros.  I cannot get the length to work correctly.  If I put 10 in the field "LENGTH" then it work fine.  However, I want the user to be able to define the length via a table.

Table Field Below:
ALPHA
NEXT_NUM
SUFFIX
LENGTH

SELECT LPAD(ALPHA||NEXT_NUM||SUFFIX, LENGTH, '0')
FROM   NEXT_NUMBER

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So the above concatenate the alpha, next_num, and suffix together.  The leading zeros is the length so for this example, say 10.  If my alpha, next_num, and suffix is 12345, it should display as 0000012345 with 0 leading zeros since my length is 10.
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Question by:holemania
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Accepted Solution

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slightwv (䄆 Netminder) earned 500 total points
ID: 41880969
First:  PL/SQL is Oracle's Procedural Language.  SQL is just SQL.

What doesn't work?

Using the code below I get:  0000012345


drop table tab1 purge;
create table tab1(
ALPHA number,
NEXT_NUM number,
SUFFIX number,
LENGTH number);

insert into tab1 values(12,34,5,10);
commit;

SELECT LPAD(ALPHA||NEXT_NUM||SUFFIX, LENGTH, '0')
FROM   tab1;

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Expert Comment

by:awking00
ID: 41881104
What are the data types for those fields?
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41881434
Just thought of something:
If you take the output and put it back into a numeric data type, you will lose the leading zeros.  LPAD returns one of the character data types like varchar2, clob, etc.. you need to keep it as such.
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Author Comment

by:holemania
ID: 41882285
Thanks slightwv.  Found out the length (6 character) wasn't long enough when my data is 7 characters long.

Reason why I kept mentioning PL/SQL is because this is the platform I am working with is Oracle.  Sometimes people tried giving me MS SQL answers and find out it's Oracle platform, and syntax may be a bit different.  Example, instead of "Print" for output it's "dbms_output.put_line" instead for oracle.  Just like your example, using "||" to concatenate is different than "+" for MS SQL.  So I just want to clarify that.
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41882294
>>Reason why I kept mentioning PL/SQL is because this is the platform I am working with is Oracle

Again, in Oracle PL/SQL is the Procedural Language used to code stored functions and procedures.  SQL is just called SQL.

Just say you want it for Oracle.  If you mention PL/SQL we think you want actual code not straight SQL.
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Author Comment

by:holemania
ID: 41882302
Sure, will keep that in mind just to mention Oracle and if sql can accomplish similar task great.   If not and PL/SQL is required, then person assisting can provide example.

Thanks again for all your help.
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Author Closing Comment

by:holemania
ID: 41882308
Thank you.  My script was working, but didn't realized that my length was only 6 and my value is 7 characters long.  

Your example helped find me discovered that.  Thanks again.
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