How to set Sqlite3 to be case insensitive when str

Question

I want to select records from sqlite3 database by string matching. But if I use '=' in the where clause, I found that sqlite3 is case sensitive. Can anyone tell me how to use string comparing case-insensitive?

Answer 1

If the column is of type char then you need to append the value you are querying with spaces, please refer to this question here . This in addition to using COLLATE NOCASE or one of the other solutions (upper(), etc).

Answer 2

This is not specific to sqlite but you can just do

SELECT * FROM ... WHERE UPPER(name) = UPPER('someone')

Answer 3

Another option that may or may not make sense in your case, is to actually have a separate column with pre-lowerscored values of your existing column. This can be populated using the SQLite function LOWER(), and you can then perform matching on this column instead.

Obviously, it adds redundancy and a potential for inconsistency, but if your data is static it might be a suitable option.

Answer 4

Simply, you can use COLLATE NOCASE in your SELECT query:

SELECT * FROM ... WHERE name = 'someone' COLLATE NOCASE

Answer 5

You can do it like this:

SELECT * FROM ... WHERE name LIKE 'someone'

(It's not the solution, but in some cases is very convenient)

"The LIKE operator does a pattern matching comparison. The operand to the right contains the pattern, the left hand operand contains the string to match against the pattern. A percent symbol ("%") in the pattern matches any sequence of zero or more characters in the string. An underscore ("_") in the pattern matches any single character in the string. Any other character matches itself or its lower/upper case equivalent (i.e. case-insensitive matching). (A bug: SQLite only understands upper/lower case for ASCII characters. The LIKE operator is case sensitive for unicode characters that are beyond the ASCII range. For example, the expression 'a' LIKE 'A' is TRUE but 'æ' LIKE 'Æ' is FALSE.)."

Answer 6

SELECT * FROM ... WHERE name = 'someone' COLLATE NOCASE