I've got a simple nvarchar(25) column in an SQL database table. Most of the time, this field should contain alphanumeric text. However, due to operator error, there are many instances where it contains only a number. Can I do a simple search in SQL to identify these cases? That is, determine which rows in the table contain only digits in this column. As an extension, could I also search for those column values which contain only digits and a space and/or slash.
In other languages (eg. Perl, Java) a regular expression would resolve this quickly and easily. But I haven't been able to find the equivalent in SQL.
yes you can achive this by using isnumeric function available in sql sever
check more at this link : http://msdn.microsoft.com/en-us/library/aa933213(SQL.80).aspx
All the answers referred to the isnumeric function, but they are not correct, I've mentioned in a comment for all the answers the flaw in the answers. The correct solution is to use a regular expression in your where clause, which contains not like '%[^0-9]%', see the example below:
select column_name from table_name where column_name not like '%[^0-9]%'
select column_name from table_name where IsNumeric(column_name) <> 1
Numeric Only:
SELECT * FROM Table WHERE ISNUMERIC(Field) = 1
With Space:
SELECT * FROM Table WHERE Field LIKE '% %'
With Slash:
SELECT * FROM Table WHERE Field LIKE '%/%'
Combined:
SELECT * FROM Table WHERE ISNUMERIC(Field) = 1 OR Field LIKE '% %' OR Field LIKE '%/%'
Related
I have a Phone number column in my table with values only being numbers and no special characters. for one of the column I got a value coming in as ":1212121212".
I will need to filter this record and any records coming in with any special characters in teradata. Can anyone help on this.
I have tried the below solutions but it is not working
where (REGEXP_SUBSTR(column_name, '[0-9]+')<>1 or column_name is null )
In MS SQL Server DB's, you can use TRYCAST to find those entries having non numeric characters:
SELECT column_name
FROM yourtable
WHERE TRY_CAST(column_name AS INT) IS NULL;
In Teradata DB's, you can use TO_NUMBER:
SELECT column_name
FROM yourtable
WHERE TO_NUMBER(column_name) IS NULL;
If you want to stay close to your attempt, can use LIKE to find not numeric entries:
SELECT column_name
FROM yourtable
WHERE column_name LIKE '%[^0-9]%';
Note this could get slow when your table has very many rows.
Thanks Jonas. Since I need only numeric values and the length should be 10, I tried the below and it worked. This would ignore all the additional special characters.
(regexp_similar(Column,'[0-9]{10}')=1)
This question is about Oracle DB. I want to know how Oracle DB query LIKE clause works on NULL values.
Select * From table_name where column_name like 'text%'
In above query, how the Oracle db treat to rows with null value for column 'column_name'? Also how about 'NOT LIKE'.
Also, I observed that rows having NULL values are not selected for the following query.
Select * From table_name where column_name NOT LIKE 'text%' .
I don't know why rows having NULL values for the column are not in results even though they are null and hence not like 'text%' .
NULL values basically fail all comparisons. The general idea is that NULL means "I don't know what the value is". So, when you use like with the pattern 'text%', the answer is "I don't know what the value is". It is NULL.
And if you use not like, the answer is the same "I don't know what the result is".
That is how NULLs work. Even with like and not like. Even with Oracle.
First one,
When you search for column_name like 'text%', db search for string that starts with "text" not other string, it doesn't matter what will come after the text. It could be anything like text123,text stack etc.
Second one,
When you search for NOT LIKE 'text%', db search for all the columns that should not be started with text, it the column value have text it will not be in the result. it is like "atext", it will be appear in the search results.
So in both condition NULL values never match so they don't come in the results.
Hope it will help.
Try this,
SELECT *
FROM table_name
WHERE NVL(column_name,1) NOT LIKE NVL('',2) -- '' OR NULL you can use
Try this,
SELECT *
FROM table_name
WHERE NVL(column_name,1) NOT LIKE NVL('',2) -- '' OR NULL you can use
I want to put a condition in my query where I have a column that should contain second position as an alphabet.
How to achieve this?
I've tried with _[A-Z]% in where clause but is not working. I've also tried [A-Z]%.
Any inputs please?
I think you want mysql query. like this
SELECT * FROM table WHERE column REGEXP '^.[A-Za-z]+$'
or sql server
select * from table where column like '_[a-zA-Z]%'
You can use regular expression matching in your query. For example:
SELECT * FROM `test` WHERE `name` REGEXP '^.[a-zA-Z].*';
That would match the name column from the test table against a regex that verifies if the second character is either a lowercase or uppercase alphabet letter.
Also see this SQL Fiddle for an example of data it does and doesn't match.
agree with #Gordon Linoff, your ('_[A-Z]%') should work.
if not work, kindly add some sample data with your question.
Declare #Table Table
(
TextCol Varchar(20)
)
Insert Into #Table(TextCol) Values
('23423cvxc43f')
,('2eD97S9')
,('sAgsdsf')
,('3Ss08008')
Select *
From #Table As t
Where t.TextCol Like '_[A-Z]%'
The use of '%[A-Z]%' suggests that you are using SQL Server. If so, you can do this using LIKE:
where col like '_[A-Z]%'
For LIKE patterns, _ represents any character. If the first character needs to be a digit:
where col like '[0-9][A-Z]%'
EDIT:
The above doesn't work in DB2. Instead:
where substr(col, 2, 1) between 'A' and 'Z'
How to retrieve a column containing special characters including alphabets in SQL Query. i have a column like this 'abc%def'. i want to retrieve '%' based columns from that table.
Please help me in this regard.
Is abc%def the column name? or column value? Not sure what you are asking but if you mean your column name contains special character then you can escape them which would be different based on specific RDBMS you are using
SQL Server use []
select [abc%def] from tab
MySQL use backquote
select `abc%def` from tab
EDIT:
Try like below to fetch column value containing % character (Checked, it works in Ingres as well)
select * from tab where col like '%%%'
Others suggest that like '%%%' works in Ingres. So this is something special in Ingres. It does not work in other dbms.
In standard SQL you would have to declare an escape character. I think this should work in Ingres, too.
select * from mytable where str like '%!%%' escape '!';
I need to match on a partial string but can't turn full-text indexing on so can't use contains. I've looked at Levenstein's function for determining the distance between two strings but I'm not looking for fuzzy matching but that every character in the column exists in the string.
I.e. If the string being passed is something like AB_SYS_20120430.TXT I want to match on any columns containing AB_SYS. The like predicate isn't getting me there. I really need the equivalent of the .NET contains feature but as mentioned turning on full text indexing isn't an option to be turned on. Thought I would see if there were any other possible work arounds.
Are you looking for the LIKE function?
http://www.w3schools.com/sql/sql_like.asp
... WHERE MyColumn LIKE '%AB_SYS%'
That may not be optimal, but it seems like it answers your question... If you can search from only the left or right side that could further optimize.
That is functionally similar to String.Contains
http://msdn.microsoft.com/en-us/library/dy85x1sa.aspx
EDIT: How will you parse the input text into the "relevant" substring?
EDIT: To search the same LIKE condition but reverse, from your partial column to the complete literal, simply append the wildcard characters:
... WHERE 'AB_SYS_20120430.TXT' LIKE '%' + MyColumn + '%'
EDIT: You have suggested that you can't get it to work. If you add the schema do your question then I can help you further but consider this:
You have a table called MyTable
In that table there is a column called MyColumn
Some rows in that table have the data 'AB_SYS' in MyColumn
Given the parameter 'AB_SYS_20120430.TXT' you want to return all matching rows
CREATE PROCEDURE MyTestProcedure
#pFullNameString nvarchar(4000) = '' -- parameter passed in, like AB_SYS_20120430.TXT
AS
BEGIN
SELECT
*
FROM
MyTable
WHERE
#pFullNameString LIKE '%' + MyTable.[MyColumn] + '%'
END
GO
You could use CHARINDEX
WHERE CHARINDEX(StringToCheckFor, StringToCheckIn) > 0