How do I select rows within a column where the string length equals 5 characters?
I am aware of length() and char_length() functions, but they seem to only be for sorting of data query results.
Any help is very appreciated.
SELECT * FROM yourtable WHERE CHAR_LENGTH(yourcolumn)=5
Related
I need to filter some results from a query where the field must have more than a given length.
I know that doesn't work, but it would be something like this:
SELECT * FROM MyTable WHERE COUNT(description) > 50
Is that doable or will I have to filter that on PHP(in my case) later?
Given you're using MySQL, you're probably looking for LENGTH().
For standard SQL, the function is called LEN().
If you are dealing with UTF-8, you will have to use CHAR_LENGTH() as LENGTH() measures the length in bytes while CHAR_LENGTH() will correctly measure the length in characters.
SELECT * FROM MyTable WHERE LENGTH(description) < 50
Use this query:
SELECT * FROM MyTable WHERE LENGTH(description) > 50
Read more: LENGTH function in mysql.
Reference: MySQL - How to select data by string length
Try This
SELECT * FROM MyTable WHERE LENGTH(description) > 50
How can I round the decimals from a count sum without having a column. A column is required in the use of ROUND(), so I am clueless. I'm trying not to create any more columns.
Here is what I have done so far and which works, but it displays too many decimals (4 after the zero). Please note that the reason that the SELECT phrase is in brackets is because it's in another SELECT phrase). What matters is that my code works, but I can't get rid of the decimals...
(SELECT (COUNT(v.id) * r.res_cpm/1000)
FROM databasename_viewcounter v
WHERE v.subject_id = r.subject_id) AS cpm_revenue
FROM databasename_resources r
WHERE r.order_id=:order_id
ORDER BY r.beginning ASC");
The following function CASTS the select statement as decimal
cast((COUNT(v.id) * r.res_cpm/1000)as decimal (10,2))
I have often SQL statements of the kind
SELECT LENGTH(col_name) FROM `table` WHERE *condition*
to establish the size of the contents of a specific column in a given row of a mySQL table. However, it is not clear to me that there is a single SQL statement that would fetch the sum of the content lengths of ALL the columns in a given row. I should add that all the columns in question are VARCHARS.
Yes, I know I could do this by fetching the entire row as
SELECT * FROM `table` WHERE *condition*
collapsing the resulting row contents into a string and getting the length of that string but I was wondering if there isn't a more efficient one liner to do the job. Any tips would be much appreciated.
Well, I prefer to use CHAR_LENGTH over LENGTH
SELECT CHAR_LENGTH(CONCAT(col1,col2,col3))
FROM tableName
WHERE...
From the linked question
LENGTH() returns the length of the string measured in bytes.
CHAR_LENGTH() returns the length of the string measured in characters.
Try this solution without going into column names:
SELECT SUM(character_maximum_length) length,
table_name
FROM information_schema.columns
WHERE table_name='your_table_name_here'
AND table_schema=DATABASE()
-- AND column_name IN ('choose', 'columns')
GROUP BY table_name;
Have you tried:
SELECT char_length(col_name)+char_length(col_name2) FROM table WHERE condition
I am trying to query a table in mysql based on the length of a string in a specific column. I know mysql has a function called LENGTH(), but that returns the length of the string. I want to be able to pull data based on the result of the LENGTH() function.
Example:
SELECT * table WHERE LENGTH(word) = 6
of course that does not work. I read through http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function%5Flength but could not find anything to help me.
yes I could make something in PhP to accomplish this, but I would like to do it at the query level.
Any help?
Try:
SELECT *
FROM table
WHERE LENGTH(RTRIM(word)) = 6
I believe you wanted to use query SELECT * FROM tableName WHERE LENGTH(word) = 6; (assuming that the word is name of column in tableName).
This is very unfortunate solution on large tables, you should create new column and use UPDATE tableName SET wordLength = LENGTH( word).
I have a column of type varchar that stores many different numbers. Say for example there are 3 rows: 17.95, 199.95 and 139.95.How can i sort that field as numbers in mysql
Quickest, simplest? use * 1
select *
from tbl
order by number_as_char * 1
The other reasons for using * 1 are that it can
survive some horrendous mishaps with underflow (reduced decimal precision when choosing what to cast to)
works (and ignores) columns of purely non-numeric data
strips numeric portions of alphanumeric data, such as 123A, 124A, 125A
If you need to sort a char column containing text AND numbers then you can do this.
tbl contains: 2,10,a,c,d,b,4,3
select * from tbl order by number_as_char * 1 asc, number_as_char asc
expected output: 2,3,4,10,a,b,c,d
If you don't add the second order by argument only numbers will be sorted - text actually gets ignored.
Use a CAST or a CONVERT function.
This approach is helpful when sorting text as numbers:
SELECT `my_field`
FROM `my_table`
ORDER BY `my_field` + 0;
Found the solution on http://crodrigues.com/trick-mysql-order-string-as-number/.
Pad the string with leading zeroes:
ORDER BY LPAD(`column`,<max length of string>,"0")
If you really have to you can do this if your source data is compatible:
SELECT column FROM table ORDER BY CAST(column AS DECIMAL(10,2))
It's not going to be very fast for large data sets though. If you can you should change the schema to use DECIMAL in the first place though. Then it can be properly indexed for better performance.