So I know how to sort a mixed column of numbers, i.e.
A1, A2, A3
My question is if it had a mixed set of numbers i.e.
Name_01022017_number-001
How would I go about sorting by that second number set and not the first set? I'd rather sort by that number than the date. Thanks.
You can use something like this:
SELECT CAST('123abc' AS UNSIGNED) AS fieldname;
and ORDER BY fieldname
First, you need to use the substring function to get the number or string you want to sort with. I assume that you want to use 001 in this case
select * from table order by substring(column, start position, len)
Related
I have tried to select something with SQL, and I've a problem with it.
What I want:
SQL SELECT * FROM table WHERE ? = '5';
Select everything which = 5, BUT not specify from which column.
Example:
From this ""database"", you should receive the 1st and the last row.
Is that possible?
You have to list the columns but you can use in. The where clause looks like:
where 5 in (price, height)
Note: This assumes that the columns have the same type. You could get type conversion errors if they are not.
Also, given the names of the column and the data, I assume that the columns are stored as numbers. Hence, I dropped the single quotes around 5. If they are really strings, then use the single quotes.
you need to add a condition to your query with or keyword so if any of them match the row will be shown as a result
SELECT * FROM tablename WHERE price =5 or height= 5
better you list your columns by name instead of using * after SELECT
I have a table and in that I want to sort a column in that table. But I’m unable to get the sorted order because there are different kinds of characters in the first place of the string. Some of them have horizontal tab, some of them have spaces, and some of them are empty. I have tried trim method but it doesn’t work for me. I have nearly 200000 records in that table. I cant update the table. I need a select query which should give the result neglecting all the unnecessary things and should sort the columns.
I think this might work
SELECT *
FROM table_name
ORDER BY IF(coloum_name LIKE "_%", substr(coloum_name, 1), coloum_name);
Explanation:
We use the IF function to strip the first character from the beginning of the string before returning the string to the ORDER BY clause. For more complex rules we could create a user-defined function and place that in the ORDER BY clause instead. Then you would have ...ORDER BY MyFunction(coloum_name)
For SQL Server, do this:
SELECT *
FROM table_name
ORDER BY CASE WHEN coloum_name LIKE "_%" THEN substr(coloum_name, 1) ELSE coloum_name END
I want to find the max value in a column.
Column values are,
E00004,
A00005,
B00011,
H-00001,
E2100112,
EFQ20098,
ESSF20003
I just want to sort the values by their number, Dont mind about the alphabets. It have to be like this, I'm using MYSQL
E2100112,
ESSF20003,
EFQ20098,
B00011,
A00005,
E00004,
H-00001
Assuming the last 5 digits are the number:
select columnName from tableName
order by convert(int, right(columnName, 5)) desc
As #IkeWalker stated, the number can have an arbitrary size.
For it, you'll have to use a while cycle to check the number.
Or, you can have a function do that for you!
Check this article!
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.
I have a field number of type varchar. Even though it is of type varchar, it stores integer values with optional leading zeros. A sort orders them lexicographically ("42" comes before "9"). How can I order by numeric values ("9" to come before "42")?
Currently I use the query:
SELECT * FROM table ORDER BY number ASC
Try this
SELECT * FROM table_name ORDER BY CAST(field_name as SIGNED INTEGER) ASC
There are a few ways to do this:
Store them as numeric values rather than strings. You've already discounted that as you want to keep strings like 00100 intact with the leading zeros.
Order by the strings cast as numeric. This will work but be aware that it's a performance killer for decent sized databases. Per-row functions don't really scale well.
Add a third column which is the numeric equivalent of the string and index on that. Then use an insert/update trigger to ensure it's set correctly whenever the string column changes.
Since the vast majority of databases are read far more often than written, this third option above amortises the cost of the calculation (done at insert/update) over all selects. Your selects will be blindingly fast since they use the numeric column to order (and no per-row functions).
Your inserts and updates will be slower but that's the price you pay and, to be honest, it's well worth paying.
The use of the trigger maintains the ACID properties of the table since the two columns are kept in step. And it's a well-known idiom that you can usually trade off space for time in most performance optimisations.
We've used this "trick" in many situations, such as storing lower-cased versions of surnames alongside the originals (instead of using something like tolower), lengths of identifying strings to find all users with 7-character ones (instead of using len) and so on.
Keep in mind that it's okay to revert from third normal form for performance provided you understand (and mitigate) the consequences.
Actually i've found something interesting:
SELECT * FROM mytable ORDER BY LPAD(LOWER(mycol), 10,0) DESC
This allows you to order the field like:
1
2
3
10
A
A1
B2
10A
111
SELECT * FROM table ORDER BY number + 0
Trick I just learned. Add '+0' to the varchar field order clause:
SELECT * FROM table ORDER BY number+0 ASC
I now see this answer above. I am wondering if this is typecasting the field and an integer. I have not compared performance. Working great.
For a table with values like Er353, ER 280, ER 30, ER36
default sort will give
ER280
ER30
ER353
ER36
SELECT fieldname, SUBSTRING(fieldname, 1, 2) AS bcd,
CONVERT(SUBSTRING(fieldname, 3, 9), UNSIGNED INTEGER) AS num
FROM table_name
ORDER BY bcd, num;
the results will be in this order
ER30
ER36
ER280
ER353
you can get order by according to your requirement my using following sql query
SELECT * FROM mytable ORDER BY ABS(mycol)
given a column username containing VARCHAR's like these:
username1
username10
username100
one could do:
SELECT username,
CONVERT(REPLACE(username, 'username', ''), UNSIGNED INTEGER) AS N
FROM users u
WHERE username LIKE 'username%'
ORDER BY N;
it is not cheap, but does the job.
SELECT * FROM table ORDER BY number ASC
Should display what you want it to display.. looks like you're sorting it by id or number is not defined as integer at the moment.
MySQL ORDER BY Sorting alphanumeric on correct order
example:
SELECT `alphanumericCol` FROM `tableName` ORDER BY
SUBSTR(`alphanumericCol` FROM 1 FOR 1),
LPAD(lower(`alphanumericCol`), 10,0) ASC
output:
0
1
2
11
21
100
101
102
104
S-104A
S-105
S-107
S-111
Another option to keep numerics at a top, then order by alpha.
IF(name + 0, name + 0, 9999999), name
Rough and ready: order by 1*field_name