I am very new to sql querys and I am looking for a way to remove the following string from anywhere in my database: [lesson-navigation] including the square brackets. (Some instances have an unnecessary extra space before and/or after the string that would be nice to delete as well if possible too.
This was a shortcode that I was inserting into my site, but then decided to implement it into the template instead. Now I have over 2000 instances of this in various places in my database and want to remove it.
Thanks in advance for your help.
~Cam
Use REPLACE() to perform a string replacement that removes the string from each column. If this string appears in multiple columns, you'll need to perform the query below for each column, or specify each column in the query (second example):
UPDATE tablename SET columnname = REPLACE(columnname, '[lesson-navigation]', '');
/* Replace in multiple columns */
UPDATE tablename SET
columnname = REPLACE(columnname, '[lesson-navigation]', ''),
columnname2 = REPLACE(columnname2, '[lesson-navigation]', ''),
columnname3 = REPLACE(columnname3, '[lesson-navigation]', '')
;
Related
I have a table named testlink and it has url and newtarget columns.
I would like to take the string expressions https://domain1.com/ here in the url column and change all the data in the newtarget column to https://domain1.com/search/?q= pulled string expression.
So briefly;
url columns from https://domain1.com/topic1
will be changed to https://domain1.com/search/?q=topic1 in the newtarget column
There are about 6 thousand different topics (lines) available.
Database: Mysql / Phpmyadmin.
use REPLACE
UPDATE testlink
SET newtarget = REPLACE(url,'https://domain1.com/','https://domain1.com/search/?q=')
MySQL REPLACE() replaces all the occurrences of a substring within a
string.
REPLACE(str, find_string, replace_with)
If you want to conditionally change the value, you can use string manipulations:
update t
set url = concat(left(url, length(url) - length(substring_index(url, '/', -1))), 'q=', substring_index(url, '/', -1))
where url like 'https://domain1.com/%';
This uses substring_index() to get the last part of the string (after the last /). It uses left() to get the first part (based on the length of the last part) and then concatenates the values you want.
Of course, test this logic using a SELECT before implementing an UPDATE.
If you're using MySQL 8, then you'd be able to do that with REGEXP_REPLACE.
For your example, this should work :
SELECT REGEXP_REPLACE('https://domain1.com/topic1','(https:\/\/domain1\.com\/)(.+)','$1search/?q=$2')
I have one column name phone_number in the database table.Right now the numbers stored in the table are format like ex.+91-852-9689568.I want to format it and just want only digits.
How can i do it in MySql ? I have tried it with using functions like REGEXP but it displays error like function does not exist.And i don't want to use multiple REPLACE.
One of the options is to use mySql substring. (As long as the format doesn't change)
SELECT concat(SUBSTRING(pNo,2,2), SUBSTRING(pNo,5,3), SUBSTRING(pNo,9,7));
if you want to format via projection only, use SELECT, you will only need to use replace twice and no problem with that.
SELECT REPLACE(REPLACE(columnNAme, '-', ''), '+', '')
FROM tableName
otherwise, if you want to update the value permanently, use UPDATE
UPDATE tableName
SET columnName = REPLACE(REPLACE(columnNAme, '-', ''), '+', '')
MySQL does not have a builtin function for pattern-matching and replace.
You'll be better off fetching the whole string back to your application, and then using a more flexible string-manipulation function on it. For instance, preg_replace() in PHP.
Try the following and comment please.
Select dbo.Regex('\d+',pNo);
Select dbo.Regex('[0-9]+',pNo);
Reference on RUBLAR.
So MYSQL is not like Oracle, hence you may just use a USer defined Function to get numbers. This could get you going.
Using MS Access 2010.
I have a field in a table that contains windows path names surrounded by quotes, like this
"C:\My Documents\Photos\img1.jpg"
"C:\My Documents\Photos\products\gizmo.jpg"
"C:\My Documents\Photos\img5.jpg"
and so on.
I need to get rid of the quotes so the column looks like this:
C:\My Documents\Photos\img1.jpg
C:\My Documents\Photos\products\gizmo.jpg
C:\My Documents\Photos\img5.jpg
Is there a way to write an update query to do this?
OR a better way to do it altogether?
If you will be doing this from within an Access session, using Access 2000 or later, you can use the Replace() function in an update query to remove the quotes. Remove would mean replace them with an empty string.
UPDATE YourTable
SET path_field = Replace(path_field, '"', '');
If any of those path strings could include quotes within them (yuck!), consider the Mid() function ... ask it to start at the 2nd character (skipping the lead quote), and return the number of characters equivalent to Len(path_field) - 2
UPDATE YourTable
SET path_field = Mid(path_field, 2, Len(path_field) - 2);
Either way, you may want to include a WHERE clause to ignore rows without path_field values.
WHERE Len(path_field) > 0
And if you must do this again when new data is added, use a different WHERE clause to ensure you UPDATE only those rows whose path_field values start and end with quotes.
WHERE path_field Like '"*"'
That was using the * wild card for Access' default ANSI 89 mode. If you will do this from ADO (ANSI 92 mode), use the % wild card.
WHERE path_field Like '"%"'
... or use ALike and the % wild card with either mode.
WHERE path_field ALike '"%"'
The solution with REPLACE already mentioned by others works, but removes ALL quotes, even if they are in the middle of the string.
If you only want to remove quotes at the beginning or at the end, but leave quotes in the middle of the string as they are, you can do it with the following two queries:
Remove first character if it's a quote:
update YourTable
set YourField = right(YourField, len(YourField) - 1)
where left(YourField, 1) = '"'
Remove last character if it's a quote:
update YourTable
set YourTable = left(YourField, len(YourField) - 1)
where right(YourField, 1) = '"'
To make this a permanent change, you might run an update query that looked something like this:
UPDATE [Your Table]
SET [Your Table].[Your Field] = Replace([Your Table].[Your Field],"""","")
This will get rid of all quotes, even if they aren't at the beginning or end. Post back if that's not exactly what you want.
Assuming your column name is MyColumn and table name is MyTable, you can use this sql to update your data to get rid of quotes.
UPDATE MyTable
SET MyColumn = REPLACE(MyColumn,'"','')
Suppose I have the following comma-delimited column value in MySQL: foo,bar,baz,bar,foo2
What is the best way to replace whatever is in the 4th position (in this case bar) of this string with barAAA (so that we change foo,bar,baz,bar,foo2 to foo,bar,baz,barAAA,foo2)? Note that bar occurs both in position 2 as well as position 4.
I know that I can use SUBSTRING_INDEX() in MySQL to get the value of whatever is in position 4, but have not been able to figure out how to replace the value in position 4 with a new value.
I need to do this without creating a UDF or stored function, via using only the standard string functions in MySQL (http://dev.mysql.com/doc/refman/5.5/en/string-functions.html).
Hmm... maybe this?
SELECT #before := CONCAT(SUBSTRING_INDEX(`columnname`,',',3),','),
#len := LENGTH(SUBSTRING_INDEX(`columnname`,',',4)+1
FROM `tablename` WHERE ...;
SELECT CONCAT(#before,'newstring',SUBSTRING(`columnname`,#len+1)) AS `result`
FROM `tablename` WHERE ...;
Replace things as needed, but that should just about do it.
EDIT: Merged into one query:
SELECT
CONCAT(
SUBSTRING_INDEX(`columnname`,',',3),
',newstring,',
SUBSTRING(`columnname`, LENGTH(SUBSTRING_INDEX(`columnname`,',',4)+1))
) as `result`
FROM `tablename` WHERE ...;
That +1 may need to be +2, I'm not sure, but that should work.
You first split your problem in two parts:
locate the comma and split the string in values separated by comma.
update the table with same string and some substring appended.
For the first part I would suggest you take a look here
And for the second part you should take a look here
One more thing there is no shortcut to any problem. You should not run from the problem. Take it as a challenge. Learn while you search for the answer. Best thing take guidance from here and Try to do more researching and efforts.
Try this:
UPDATE yourtable
SET
categories =
TRIM(BOTH ',' FROM
REPLACE(
REPLACE(CONCAT(',',REPLACE(col, ',', ',,'), ','),',2,', ''), ',,', ',')
)
WHERE
FIND_IN_SET('2', categories)
taken from here The best way to remove value from SET field?
I have a question about replacement a particular string in mysql but one part of the string is is changed every time e.g
"(my string to replace 1224:2)"
"(my string to replace 134:4)"
"(my string to replace 1824:9)"
"(my string to replace 14:2)"
I can change first part of string using this query
update dle_post set short_story = replace(short_story,'(my','( my');
but how to replace other parts like 1224:2) , or 14:2) or any other part that ends with a number 1,2,3.. and a ). I can not use bracket ")" because it is used on many other places.
Not the most elegant way, but...
update dle_post
set short_story =
replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(
short_story,
'0)','0 )'),'1)','1 )'),'2)','2 )'),'3)','3 )'),'4)','4 )'),'5)','5 )'),'6)','6 )'),'7)','7 )'),'8)','8 )'),'9)','9 )');
Regular expressions should work in this kind of case. Take a look related question: How to do a regular expression replace in MySQL?