SQLite字符串拼接

转自http://blog.csdn.net/zhjp4295216/article/details/5776954

 

select path || '%'  from t_category where depth = 0 and type = 0

用'||'拼接字符串

比如path是/1001/的话 那结果就是/1001/%

 

数字相加

SELECT 'A'+'B'  结果为0

SELECT "A"+"1" 结果为1

SELECT "A"+1   结果为1

SELECT 2+1 结果为3

=在“+”运算中，SQLite将字符串非数字串都当作0处理了

 

|| String Concatenation
* Arithmetic Multiply
/ Arithmetic Divide
% Arithmetic Modulus
+ Arithmetic Add
– Arithmetic Subtract
<< Bitwise Right shift
>> Bitwise Left shift
& Logical And
| Logical Or
< Relational Less than
<= Relational Less than or equal to
> Relational Greater than
>= Relational Greater than or equal to
= Relational Equal to
== Relational Equal to
<> Relational Not equal to
!= Relational Not equal to
IN Logical In
AND Logical And
OR Logical Or
LIKE Relational String matching
GLOB Relational Filename matching