how to use substring function sqlite android

问题

suppose I have a table name : TEST, that it has 2 columns ID and CONTENT, like this :

TEST TABLE :

ID ======= CONTENT

0 ======= hello world

now, how can I split CONTENT column from 0 index to 5 index to retrieve just hello word? (at here, ID=> 0) (I just want to use sql, not other functions in others languages );

回答1:

select substr(content, 0, 5) from test

回答2:

The substr(X,Y,Z) function returns a substring of input string X that begins with the Y-th character and which is Z characters long. If Z is omitted then substr(X,Y) returns all characters.

The answer to your question is:

select substr(content, 0, 5) from test where id >= 0;

回答3:

Check substr() function in sqlite3 core functions. It will let achieve what you need.

Use it as:

SELECT substr(content, 0, 5) FROM test WHERE id >= 0;

来源：https://stackoverflow.com/questions/25531689/how-to-use-substring-function-sqlite-android