I have a column in a oracle table Lic_num char(7 byte)
SELECT column1, 'ABC' + Lic_num
FROM TABLE One
I wanted ABC appended to all the rows that are returned with lic_num
appended to it.
I tried tha above query and it is not working.
In Oracle it's:
SELECT column1, 'ABC' || Lic_num
FROM TABLE_ONE
This would be the way of doing it.
SELECT column1, 'ABC' || Lic_num FROM TABLE_ONE;
SELECT CONCAT(CONCAT(column1, 'ABC'), Lic_num) FROM TABLE_ONE;
If you need you can rename the concatenated Column name using AS keyword so it would be meaningful in terms of reporting.
Below info is included to help someone looking at concatenation in detail.
There are two ways to concatenate Strings in Oracle SQL. Either using CONCAT function or || operator.
CONCAT function allows you to concatenate two strings together
SELECT CONCAT( string1, string2 ) FROM dual;
Since CONCAT function will only allow you to concatenate two values together. If you want to concatenate more values than two, you can nest multiple CONCAT function calls.
SELECT CONCAT(CONCAT('A', 'B'),'C') FROM dual;
An alternative to using the CONCAT function would be to use the || operator
SELECT 'My Name' || 'My Age' FROM dual;
Related
Let's say I have one query that returns column1, column2. I'd like to be able to format the result to a desirable output in Oracle.
I want to mess up with strings that's why I'm asking that question ~~.
create table taTest(
column1 varchar(50),
column2 varchar(50)
)
this is the basic query that I want to format the result from :
select distinct(column1),column2 from taTest;
desired output(for each query result) : column1value(column2value)
I've tried something like this :
select wm_concat(distinct(column1)||'('||column2||')') as result from taTest;
But it seems like I'm not using wm_concat the right way.
Thanks for any input you might provide.
This distinct(column1), column2 is one of the biggest fallacies that I've seen. Because this is same as
select distinct column1, column2. . .
Hence, all you need is this
select
column1 || '('|| column2 || ')' as result
from
taTest
group by
column1, column2;
In this case group by and distinct perform same function
Going back to distinct(column1) - this is false function. The rule of SQL parsing is that anything within ( ) considered a single word\group. Hence (column1) is separated from distinct using () vs empty space -same thing. You can do
select distinct (column1), (column2) . . -- same thing
I need help
i have records 123,456,789 in rows when i am execute like
this one is working
select * from table1 where num1 in('123','456')
but when i am execute
select * from table1 where num1 in(select value from table2)
no resultset found - why?
Check the DataType varchare2 or Number
try
select * from table1 where num1 in(select to_char(value) from table2)
Storing comma separated values could be the cause of problem.
You can try using regexp_substr to split comma.
First and foremost, an important thing to remember: Do not store numbers in character datatypes. Use NUMBER or INTEGER. Secondly, always prefer VARCHAR2 datatype over CHAR if you wish to store characters > 1.
You said in one of your comments that num1 column is of type char(4). The problem with CHAR datatype is that If your string is 3 characters wide, it stores the record by adding extra 1 space character to make it 4 characters. VARCHAR2 only stores as many characters as you pass while inserting/updating and are not blank padded.
To verify that you may run select length(any_char_col) from t;
Coming to your problem, the IN condition is never satisfied because what's actually being compared is
WHERE 'abc ' = 'abc' - Note the extra space in left side operator.
To fix this, one good option is to pad the right side expression with as many spaces as required to do the right comparison.The function RPAD( string1, padded_length [, pad_string] ) could be used for this purpose.So, your query should look something like this.
select * from table1 where num1 IN (select rpad(value,4) from table2);
This will likely utilise an index on the column num1 if it exists.
The other one is to use RTRIM on LHS, which is only useful if there's a function based index on RTRIM(num1)
select * from table1 where RTRIM(num1) in(select value from table2);
So, the takeaway from all these examples is always use NUMBER types to store numbers and prefer VARCHAR2 over CHAR for strings.
See Demo to fully understand what's happening.
EDIT : It seems You are storing comma separated numbers.You could do something like this.
SELECT *
FROM table1 t1
WHERE EXISTS (
SELECT 1
FROM table2 t2
WHERE ',' ||t2.value|| ',' LIKE '%,' || rtrim(t1.num1) || ',%'
);
See Demo2
Storing comma separated values are bound to cause problems, better change it.
Let me tell you first,
You have stored values in table2 which is comma seperated.
So, how could you match your data with table1 and table2.
Its not Possible.
That's why you did not get any values in result set.
I found the Solution using string array
SELECT T.* FROM TABLE1 T,
(SELECT TRIM(VALUE)AS VAL FROM TABLE2)TABLE2
WHERE
TRIM(NUM1) IN (SELECT COLUMN_VALUE FROM TABLE(FUNC_GETSTRING_ARRAY(TABLE2.VAL)))
thanks
I have (and don't own, so I can't change) a table with a layout similar to this.
ID | CATEGORIES
---------------
1 | c1
2 | c2,c3
3 | c3,c2
4 | c3
5 | c4,c8,c5,c100
I need to return the rows that contain a specific category id. I starting by writing the queries with LIKE statements, because the values can be anywhere in the string
SELECT id FROM table WHERE categories LIKE '%c2%';
Would return rows 2 and 3
SELECT id FROM table WHERE categories LIKE '%c3%' and categories LIKE '%c2%'; Would again get me rows 2 and 3, but not row 4
SELECT id FROM table WHERE categories LIKE '%c3%' or categories LIKE '%c2%'; Would again get me rows 2, 3, and 4
I don't like all the LIKE statements. I've found FIND_IN_SET() in the Oracle documentation but it doesn't seem to work in 10g. I get the following error:
ORA-00904: "FIND_IN_SET": invalid identifier
00904. 00000 - "%s: invalid identifier"
when running this query: SELECT id FROM table WHERE FIND_IN_SET('c2', categories); (example from the docs) or this query: SELECT id FROM table WHERE FIND_IN_SET('c2', categories) <> 0; (example from Google)
I would expect it to return rows 2 and 3.
Is there a better way to write these queries instead of using a ton of LIKE statements?
You can, using LIKE. You don't want to match for partial values, so you'll have to include the commas in your search. That also means that you'll have to provide an extra comma to search for values at the beginning or end of your text:
select
*
from
YourTable
where
',' || CommaSeparatedValueColumn || ',' LIKE '%,SearchValue,%'
But this query will be slow, as will all queries using LIKE, especially with a leading wildcard.
And there's always a risk. If there are spaces around the values, or values can contain commas themselves in which case they are surrounded by quotes (like in csv files), this query won't work and you'll have to add even more logic, slowing down your query even more.
A better solution would be to add a child table for these categories. Or rather even a separate table for the catagories, and a table that cross links them to YourTable.
You can write a PIPELINED table function which return a 1 column table. Each row is a value from the comma separated string. Use something like this to pop a string from the list and put it as a row into the table:
PIPE ROW(ltrim(rtrim(substr(l_list, 1, l_idx - 1),' '),' '));
Usage:
SELECT * FROM MyTable
WHERE 'c2' IN TABLE(Util_Pkg.split_string(categories));
See more here: Oracle docs
Yes and No...
"Yes":
Normalize the data (strongly recommended) - i.e. split the categorie column so that you have each categorie in a separate... then you can just query it in a normal faschion...
"No":
As long as you keep this "pseudo-structure" there will be several issues (performance and others) and you will have to do something similar to:
SELECT * FROM MyTable WHERE categories LIKE 'c2,%' OR categories = 'c2' OR categories LIKE '%,c2,%' OR categories LIKE '%,c2'
IF you absolutely must you could define a function which is named FIND_IN_SET like the following:
CREATE OR REPLACE Function FIND_IN_SET
( vSET IN varchar2, vToFind IN VARCHAR2 )
RETURN number
IS
rRESULT number;
BEGIN
rRESULT := -1;
SELECT COUNT(*) INTO rRESULT FROM DUAL WHERE vSET LIKE ( vToFine || ',%' ) OR vSET = vToFind OR vSET LIKE ('%,' || vToFind || ',%') OR vSET LIKE ('%,' || vToFind);
RETURN rRESULT;
END;
You can then use that function like:
SELECT * FROM MyTable WHERE FIND_IN_SET (categories, 'c2' ) > 0;
For the sake of future searchers, don't forget the regular expression way:
with tbl as (
select 1 ID, 'c1' CATEGORIES from dual
union
select 2 ID, 'c2,c3' CATEGORIES from dual
union
select 3 ID, 'c3,c2' CATEGORIES from dual
union
select 4 ID, 'c3' CATEGORIES from dual
union
select 5 ID, 'c4,c8,c5,c100' CATEGORIES from dual
)
select *
from tbl
where regexp_like(CATEGORIES, '(^|\W)c3(\W|$)');
ID CATEGORIES
---------- -------------
2 c2,c3
3 c3,c2
4 c3
This matches on a word boundary, so even if the comma was followed by a space it would still work. If you want to be more strict and match only where a comma separates values, replace the '\W' with a comma. At any rate, read the regular expression as:
match a group of either the beginning of the line or a word boundary, followed by the target search value, followed by a group of either a word boundary or the end of the line.
As long as the comma-delimited list is 512 characters or less, you can also use a regular expression in this instance (Oracle's regular expression functions, e.g., REGEXP_LIKE(), are limited to 512 characters):
SELECT id, categories
FROM mytable
WHERE REGEXP_LIKE('c2', '^(' || REPLACE(categories, ',', '|') || ')$', 'i');
In the above I'm replacing the commas with the regular expression alternation operator |. If your list of delimited values is already |-delimited, so much the better.
I would like to delete multiple substrings from one column. I tried the replace function with the following code:
select replace('testetstestetststst', 'test'||'et'||'s', '')
from dual;
My expected result is ttt, but I get tstst.
In R it works with:
gsub("test|et|s", "", "testetstestetststst")
How can I replace many different substrings with nothing ('') in a column in clob format in Oracle SQL?
You need the REGEXP version of REPLACE:
select regexp_replace('testetstestetststst', 'test|et|s', '')
from dual;
In your code, you are concatenating strings, instead of using an OR operator; that is, your code is equivalent to
select replace('testetstestetststst', 'testets', '')
from dual;
Rather than using regular expressions, you can nest multiple REPLACE functions:
SELECT REPLACE(
REPLACE(
REPLACE(
'testetstestetststst',
'test'
),
'et'
),
's'
)
FROM DUAL;
We can directly use decode function.
select decode(job,'clerk','1','manager','2','salesman','3',4) from emp;
This will replace clerk with 1,manager with 2,salesman with 3 and other values with 4.
Is there a fairly simple way to take an input parameter containing a comma seperated list of prefixes and return a cursor based on a select statement that uses these?
i.e. (Pseudocode)
PROCEDURE get_by_prefix(p_list_of_prefixes IN varchar2, r_csr OUT SYS_REFCURSOR)
IS
BEGIN
OPEN r_csr FOR
SELECT * FROM my_table where some_column LIKE (the_individual_fields_from p_list_of_prefixes ||'%')
END
I've tried various combinations, and now have two problems - coercing the input into a suitable table (I think it needs to go into a table type rather than a VARCHAR2_TABLE), and secondly getting the like clause to be effectively a SELECT from an internal 'pseudotable'...
EDIT: It seems that people are suggesting ways to use 'IN' with a set of potential values - whereas Im looking at using LIKE. I could use a similar technique - building up dynamic SQL, but was wondering if there isnt a more elegant way...
PL/SQL has no concept of a comma-separated list and no built-in splitter as in Perl etc, so you'll have to use one of the hand-rolled methods such as this one:
https://stewashton.wordpress.com/2016/08/01/splitting-strings-surprise
(Other methods are available.) Then it's just a matter of either populating a collection in one step and using it in the next, or else combining the two as something like this:
declare
p_list_of_prefixes varchar2(100) := 'John,Jim,Jules,Janice,Jenny';
begin
open :refcur for
with params as
( select x.firstname
from xmltable(
'ora:tokenize($X, "\,")'
passing p_list_of_prefixes as x
columns firstname varchar2(4000) path '.'
) x
)
, people as
( select 'Dave Clark' as fullname from dual union all
select 'Jim Potter' from dual union all
select 'Jenny Jones' from dual
)
select x.firstname, p.fullname
from params x
left join people p on p.fullname like x.firstname || '%';
end;
Output:
FIRSTNAME FULLNAME
-------------- -----------
John
Jim Jim Potter
Jules
Janice
Jenny Jenny Jones
Using LIKE the way you want is easy, but it is the wrong solution. (See my Comment under the original post).
Anyway - if by order of your superiors, or some other semi-legitimate reason, you must use a LIKE condition, it should look something like this:
... where ',' || p_list_of_whatever || ',' like '%,' || some_column || ',%
Concatenating commas at both ends of both sides of the comparison is needed, because you don't want Jo in the column to match John in the input list. Start from there and you will see why you need the commas on the right-hand side, and then follow from there and you will see why you need them on the left also.