在Oracle SQL Developer中搜索包含空格的字符串

Question

suppose you are selecting a row of a table that contains the field X equal to a certain String, and this string contains spaces

in my case I've

select * from table_name where serial = '400 TZV 50'

I know this record exists, but the query return me an empty set.

Anyone could help me?

Answer 1

 select * from table_name where serial = '400 TZV 50' 

I know this record exists, but the query return me an empty set.

For example, if you have the records:

SQL Fiddle

Oracle 11g R2 Schema Setup :

CREATE TABLE table_name ( serial VARCHAR2(64) );
INSERT INTO table_name
  SELECT '400 TZV  50' FROM DUAL UNION ALL                      -- Extra space in middle
  SELECT '400 TZV 50 ' FROM DUAL UNION ALL                      -- Extra space at the end
  SELECT '400 TZV 50' || CHR(13) || CHR(10) FROM DUAL UNION ALL -- CR/LF at the end
  SELECT '400' || CHR(9) || 'TZV 50' FROM DUAL;                 -- Tab instead of space

To find the records that you think should match. You can either use LIKE :

SELECT serial, '400 TZV 50' AS match
FROM   table_name
WHERE  serial LIKE '400%TZV%50%'

or REGEXP_LIKE :

SELECT serial, '400 TZV 50' AS match
FROM   table_name
WHERE  REGEXP_LIKE( serial, '400\s+TZV\s+50\s*' )

Which both output:

Results :

|       SERIAL |      MATCH |
|--------------|------------|
|  400 TZV  50 | 400 TZV 50 |
|  400 TZV 50  | 400 TZV 50 |
| 400 TZV 50   | 400 TZV 50 |
|              |            |
|   400 TZV 50 | 400 TZV 50 |

then you can look and see whether the values are different.

If you cannot see why it is not matching then use the DUMP function to get the underlying byte values in the data types:

SELECT DUMP( serial ) AS serial, DUMP( '400 TZV 50' ) AS match
FROM   table_name
WHERE  REGEXP_LIKE( serial, '400\s+TZV\s+50\s*' )

Which outputs:

Results :

|                                            SERIAL |                                        MATCH |
|---------------------------------------------------|----------------------------------------------|
|    Typ=1 Len=11: 52,48,48,32,84,90,86,32,32,53,48 | Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 |
|    Typ=1 Len=11: 52,48,48,32,84,90,86,32,53,48,32 | Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 |
| Typ=1 Len=12: 52,48,48,32,84,90,86,32,53,48,13,10 | Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 |
|        Typ=1 Len=10: 52,48,48,9,84,90,86,32,53,48 | Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 |

And you can see that the values are different (ignore the typ value as one is a string literal and the other is a VARCHAR2 stored in a table):

• the first row has a different length from an extra space in the middle:

   Typ= 1 Len=11: 52,48,48,32,84,90,86,32,32,53,48 Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 ^^ ^^ 

• the second has a different length from an extra space at the end:

   Typ= 1 Len=11: 52,48,48,32,84,90,86,32,53,48,32 Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 ^^ ^^^ 

• the third has a different length from CR/LF characters at the end:

   Typ= 1 Len=12: 52,48,48,32,84,90,86,32,53,48,13,10 Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 ^^ ^^^^^^ 

• and the last row has an ASCII value of 9 (tab) in the 4th character when an ASCII value of 32 (space) is expected.

   Typ= 1 Len=10: 52,48,48,9,84,90,86,32,53,48 Typ=96 Len=10: 52,48,48,32,84,90,86,32,53,48 ^^ 

Once you have worked out why your query is not matching then you can adapt it to either match the actual data or, if the data is incorrectly formatted, you can fix the values in the table to be of the expected format.

Answer 2

这将工作：

select * from table_name where serial like '400%TZV%50';