sqlite 字符串拼接
select path || ‘%‘ from t_category where depth = 0 and type = 0
用‘||‘拼接字符串
比如path是/1001/的話 那結果就是/1001/%
數字相加
SELECT ‘A‘+‘B‘ 結果為0
SELECT "A"+"1" 結果為1
SELECT "A"+1 結果為1
SELECT 2+1 結果為3
=在“+”運算中,SQLite將字符串非數字串都當作0處理了
|| String Concatenation
* Arithmetic Multiply
/ Arithmetic Divide
+ 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 Not equal to
!= Relational Not equal to
IN Logical In
AND Logical And
OR Logical Or
LIKE Relational String matching
GLOB Relational Filename matching
sqlite 字符串拼接