I try to get rid of some digits in my table.
What is wrong with this:
UPDATE tbl SET `name` = REGEXP_REPLACE(`name`,[:digit:],'')
it won't execute showing: REGEXP_REPLACE is not valid at this position...
thanx.
You put the field between comma: 'name'. Your query is trying to REGEXP replace inside the text 'name'. Rremove the quotes to replace your field value:
UPDATE tbl SET name = REGEXP_REPLACE(name,[:digit:],'')
Related
In a SQL table I have two columns: the first contain a path and the second contains a value.
colunm1
/path/
colunm2
12345
I need to update the first column with the value that exists in the second column. to get this result :
colunm1
/path/12456/
I tried this, but not working
update tablename p
set p.colunm1 = "/path/'colunm2'/"
You have the right idea, but the SQL you shared uses column2 as a string literal. You could use the concat to concatenate the two columns:
UPDATE tablename
SET column1 = CONCAT(column1, column2)
You have to use CONCAT
update tablename p
set p.colunm1 = CONCAT("/path/",`colunm2`,"/");
Im trying to update a field only if the field contains certain characters j,k,l,m,n,o,p,q,r
I want to avoid using update tbl set field = field2 where field like '%j' or field like '%k' ...etc.
Is there some syntax to create a list of the characters I am looking for?
Try this in MySQL:
update tbl set field = field2 where field REGEXP 'j|k|l|m|n|o|p|q|r';
You can use regular expressions with the RegExp keywork.
I am trying to remove name_ part of each name in database, name_ is mistakenly inserted into db and now in 30 object names. if i remove manuelly from db, it takes me much time.
one example is: name_john. it should be john.
how can i delete this name_ from all names of all objects in db with some sql statement?
If it are column values you can do it with an update statement.
UPDATE table_reference
SET column_reference = SUBSTRING(column_reference, 6)
WHERE column_reference LIKE 'name\_%' ESCAPE '\'
If this is about column values that you need to modify, you could use the REPLACE() function like this:
UPDATE tablename
SET columnname = REPLACE(columnname, 'name_', '')
WHERE columnname LIKE '%name\_%' ESCAPE '\'
;
That would remove all entries of name_ in columnname. If there can be no more than one entry (or if only one needs to be removed) and its position is fixed, you could use the INSERT() function instead, which, despite its name, can also replace and delete substrings. This is how you could use it if the position of name_ was e.g. at the beginning:
UPDATE tablename
SET columnname = INSERT(columnname, 1, 5, '')
WHERE columnname LIKE 'name\_%' ESCAPE '\'
;
I have a database table in MYSQL with around 1000 rows. In the table I have a column called 'overview'. In each row, this column has some value and at the end of that value I have a specific line (text) starting with: 'Source...'
Now what I want is, I want to remove this line from each column and replace it with some other text content.
I believe it can be accomplished with some smart query.
You can simply use REPLACE in your query like this
UPDATE your_table SET col_name = REPLACE(col_name , ‘Source...’, ‘new_val’)
WHERE col_name LIKE '%Source...';
Check Out the SQLFIDDLE.
MySQL database has a handy and simple string function REPLACE() that allows table data with the matching string (from_string) to be replaced by new string (to_string).
The syntax of REPLACE is:
REPLACE (text_string, from_string, to_string)
In your case, you can do this way:
UPDATE `tableName` SET `column` = REPLACE(column , 'Source...', 'Replaced Value')
Use Replace
update TBL
set overview = Replace(picture, 'Source..', 'replacement')
keep a backup of the table before anything.Or you can do it on a copy.
you can do this by following:
update table_name set col_name = replace(column_name , ‘Source...’, ‘Replaced String...’);
I need a SQL update statement for updating a particular field of all the rows with a string "test" to be added in the front of the existing value.
For example, if the existing value is "try" it should become "testtry".
You can use the CONCAT function to do that:
UPDATE tbl SET col=CONCAT('test',col);
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
UPDATE tablename SET fieldname = CONCAT("test", fieldname) [WHERE ...]
Many string update functions in MySQL seems to be working like this:
If one argument is null, then concatenation or other functions return null too.
So, to update a field with null value, first set it to a non-null value, such as ''
For example:
update table set field='' where field is null;
update table set field=concat(field,' append');
That's a simple one
UPDATE YourTable SET YourColumn = CONCAT('prependedString', YourColumn);
UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column1) where 1
UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column2) where 1
UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column2, 'newtring2') where 1
We can concat same column or also other column of the table.