I have a field in oracle database which contained the following string:
Description:
This is first line (ABC)
This is second line (123)
Under the oracle table, it is displayed as one line without a space:
"this is first line (ABC)This is second line (123)"
The first line is ended with carriage return.
How to export only the second line (after a carriage return) and ignore the first line?
this is just a rough idea, hopefully it can guide you:
str = "this is first line (ABC)This is second line (123)";
SELECT SUBSTR(str, INSTR(str, '\n')) from dual;
Related
I am very new to ruby and I want to check for rows with the same number in a csv file.
What I am trying to do is go through the input csv file and copy element from the input file to the output file also adding another column called "duplicate" to the output file, then check if a similar phone is already in the output file while copying data from input to output then if the phone already exist, add "dupl" to the row in the duplicate column.
This is what I have.
file=CSV.read('input_file.csv')
output_file=File.open("output2.csv","w")
for row in file
output_file.write(row)
output_file.write("\n")
end
output_file.close
Example:
Phone
(202) 221-1323
(201) 321-0243
(202) 221-1323
(310) 343-4923
output file
Phone
Duplicate
(202) 221-1323
(201) 321-0243
(202) 221-1323
dupl
(310) 343-4923
So basically you want to write the input to output and append a "dupl" on the second occurrence of a duplicate?
Your input to output seems fine. To get the "dupl" flag, simply count the occurrence of each number in the list. If it's more than one, its a duplicate. But since you only want the flag to be shown on the second occurrence just count how often the number appeared up until that point:
lines = CSV.read('input_file.csv')
lines.each_with_index do |l,i|
output_file.write(l + ",")
if lines.take(i).count(l) >= 1
output_file.write("dupl")
end
output_file.write("\n")
end
l is the current line. take(i) is all lines before but not including the current line and count(l) applied to this counts how often the number appeared before if it's more than one, print a "dupl"
There probably is a more efficient answer to this, this is just a quick and easy to understand version.
In SQLPlus, how do I add string that contains a special character to my database? The special character I am trying to use is 'é'.
I've tried Aim(atl+130) which is: Aimé but returns 'Aim?'
I copied your character and did this to find the value 233:
select dump('é') from dual;
So you should be able to do this and get it back (of course you can INSERT it too):
select 'Aim' || chr(233) from dual;
I don't understand where this AS statement is going wrong.
This works fine:
LOAD CSV WITH HEADERS FROM
'file:///some_csv.csv' AS line
WITH SPLIT(line.`date`, '/') AS date
RETURN date
and I get the date returned. This must mean there was no problem with the AS date part.
However, when I continue and try to break a date up, I get an error saying
line not defined (line 4, column 27 (offset: 156))
Here's the code that fails:
LOAD CSV WITH HEADERS FROM
'file:///some_csv.csv' AS line
WITH SPLIT(line.`date`, '/') AS date
CREATE (n:Node {id: line.`id_from_csv`})
SET n.year= TOINT(date[2])
What about the WITH SPLIT ruined my AS line?
LOAD CSV WITH HEADERS FROM
'file:///some_csv.csv' AS line
WITH line, SPLIT(line.`date`, '/') AS date
CREATE (n:Node {id: line.`id_from_csv`})
SET n.year= TOINT(date[2])
should work (untested). The moment you introduce the WITH, it's like a boundary between the previous part of the query and the current path, so at post point, line is out of scope unless you choose to carry it forward.
I'm selecting an email address but I don't want to display the full email. Only the part before the '#'. How can I cut it. I know how to display only certain amount of characters or numbers. But how do I specify to display only till the '#' symbol.
Thank you.
Recent versions of Informix SQL have the CHARINDEX() function which can be used to isolate where the '#' symbol appears:
SELECT LEFT(email_addr, CHARINDEX('#', email_addr)-1)
CHARINDEX() will return 0 if not found, otherwise the ordinal position of the located string. My testing found that LEFT() doesn't complain about being passed 0 or -1, so it's safe to execute this as is, you don't have to verify that you get something back from CHARINDEX() first.
CREATE TEMP TABLE ex1
(
email_addr VARCHAR(60)
) WITH NO LOG;
INSERT INTO ex1 VALUES ('ret#example.com.au');
INSERT INTO ex1 VALUES ('emdee#gmail.com');
INSERT INTO ex1 VALUES ('unknown');
INSERT INTO ex1 VALUES (NULL);
INSERT INTO ex1 VALUES ('#bademail');
SELECT LEFT(email_addr, CHARINDEX('#', email_addr)-1) FROM ex1
... produces:
(expression)
ret
emdee
5 row(s) retrieved.
If you have an older version of Informix that doesn't support CHARINDEX(), you'll be forced to iterate through the string character by character, until you find the '#' symbol.
I have a long list of information stored in a variable and I need to run some regex expressions against that variable and get various pieces of information from what is found.
How can you store the line that matches a regex expression in a variable?
How can you get the line number of the line that matches a regex expression?
Here is an example of what I'm talking about.
body = "service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname switch01
!
boot-start-marker"
If I search for the line that contains "hostname" I need the line number, in this case it would be 4. I also need to store the line "hostname switch01" as another variable.
Any ideas?
Thanks!
First you'd want to convert the string to lines: body.split('\n'), then you want to add line numbers to the lines: .each_with_index. Then you want to select the lines .select {|line, line_nr| line =~ your_regex }. Putting it all together:
body.split('\n').each_with_index
.select {|line, line_nr| line =~ your_regex }
.map {|line, line_nr| line_nr }
This will give you all the lines matching 'your_regex'
Let's say you have an object file that provides a #lines method:
lines = file.lines.each_with_index.select {|line, i| line =~ /regex/ }
If you already have a list of lines you can leave out the call to #lines. If you have a string you can use string.split("\n").
This will result in the variable lines containing an array of 2-element arrays with the line that matched your RegEx and the index of the line in the original file.
Breakdown
file.lines gets the lines - of course the other methods I mentioned might also apply here for you. We then add the index to each element with #each_with_index, because you want to store these as well. This has the same effect as #map.with_index {|e, i| [e, i]}, i.e. map every element to [element, index]. We then use the #select method to get all lines that do match your RegEx (FYI, =~ is the matching operator in Ruby, Perl and other languages - in case you didn't already know). We're done after that, but you might need to further transform the data so you can process it.