摘要：
SELECT GROUP_CONCAT(NUMB SEPARATOR '&') FROM ( SELECT @num :=@num + 1 AS NUMB FROM information_schema. TABLES t1, information_schema. TABLE... 阅读全文
摘要：
SET @ROW_NUMBER:=0; select round(avg(LAT_N),4) from ( select @Row_Number := @Row_Number +1 as count_of_group, LAT_N , (SELECT COUNT(*) FROM Station ) AS... 阅读全文
摘要：
Problem Description Analysis: We can use REPEAT function to solve problem. The syntax is REPEAT(str, count), str is the string to repeat and count is 阅读全文