SQL不区分大小写的IN搜索

Question

I have this Table "Table" with content:

+--------+
| Serial |
+--------+
| d100m  | <- expected result
| D100M  | <- expected result
| d200m  | <- expected result
| d300L  |
| D400R  |
+--------+

There are case inaccurate serial numbers stored.

Currently I am selecting there with a statement like

SELECT Serial FROM Table WHERE Serial LIKE 'D100M' OR Serial LIKE 'D200M';

But isn't there a easier way instead of OR Serial LIKE OR Serial LIKE OR Serial LIKE there are alomst 30 numbers i have to compare with.

Something like this

SELECT Serial FROM Table WHERE Serial LIKE IN ('D100M', 'D200M')

Answer 1

The easiest way would be:

SELECT Serial 
FROM Table 
WHERE upper(Serial) in ('D100M', 'D200M');

That won't however use an index on the serial column.

So if performance is a concern you would need to create an index on upper(serial) .

Answer 2

SELECT Serial FROM Table WHERE Serial IN ('D100M', 'D200M',<addAllSerialsHereCommaSeparated>)

更新：如果应该大写检查所有序列号，则可以使用：

SELECT Serial FROM Table WHERE upper(Serial) IN ('D100M', 'D200M',<addAllSerialsHereCommaSeparated>)

Answer 3

as long as you do not use wildcards or other like operator characters, you can use this script:

SELECT Serial FROM Table WHERE upper(Serial) IN ('D100M', 'D200M')

other wise, you need a full text search.

Answer 4

I assume that you want to get the records with ignoring the case. You can use upper or lower function and do something like:

SELECT Serial FROM Table WHERE Upper(Serial) IN ('D100M', 'D200M')

Or

SELECT Serial FROM Table WHERE Lower(Serial) IN ('d100m', 'd200m')

Answer 5

Use the below query format:

select * from dual where upper(DUMMY) in (SELECT upper(x.split_values)
FROM
  (WITH T AS
  (SELECT 'A,B,C,D,E,F' STR FROM DUAL
  )
SELECT REGEXP_SUBSTR (STR, '[^,]+', 1, LEVEL) SPLIT_VALUES
FROM T
  CONNECT BY LEVEL <=
  (SELECT LENGTH (REPLACE (STR, ',', NULL)) FROM T
  )
  ) x
)

The query in the IN clause converts your comma separated list to rows...the final selection in x.split values is converted to upper and then returned as columns.

finally it is supplied to IN clause as a mini table...

This is Oracle Specific.

in case of MS SQL this link may be useful to perform same ops...: http://sqljason.com/2010/05/converting-single-comma-separated-row.html

Answer 6

you may check following:

SELECT Serial
FROM Table
WHERE (Serial collate SQL_latin1_general_cp1_cs_as)
      IN ('D100M', 'D200M', 'd200m');

It should get correct and desired information.