sqlite 含有concat函数吗

答案：http://www.sqlite.org/lang_corefunc.html

根据官方主页目前没有concat函数

有substr ，但是没有concat

substr(X,Y,Z)
substr(X,Y)	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 through the end of the string X beginning with the Y-th. The left-most character of X is number 1. If Y is negative then the first character of the substring is found by counting from the right rather than the left. If Z is negative then the abs(Z) characters preceding the Y-th character are returned. If X is a string then characters indices refer to actual UTF-8 characters. If X is a BLOB then the indices refer to bytes.

其他：sqlite的concat可以用||替代
比如：
select concat('a', 'b') as mix;
换成
select 'a'||'b' as mix; 

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