ExcelVBA连接MySQL,该怎么解决?
conn.ConnectionString = "Driver={sql server};server=SVCTAG-JH5JL2X;uid=lims;pwd=;database=lims"conn.Open
mysql workbench如何定义函数functions?
CREATE FUNCTION 函数名称(参数列表) RETURNS 返回值类型 函数体 如: CREATE FUNCTION IF EXIST deleteById(uid SMALLINT UNSIGNED) RETURNS VARCHAR(20) BEGIN DELETE FROM son WHERE id = uid; RETURN (SELECT COUNT(id) FROM son); END 调用如: select 函数名(参数列表);
MYSQL多表联合查询 (4表)?
SELECTA.ID,A.NUMBER,A.PRICE,A.ORDER_TIME,B.USER_ID,B.STARTIME,B.STOPTIME,C.CHANNEL_PAY,D.COMPANYFROMD表DLEFTJOINA表AONA.COMPANY_ID=D.UIDLEFTJOINB表BONB.COMPANY_ID=D.UIDLEFTJOINC表CONC.COMPANY_ID=D.UID有条件的再加行:WHERE..........排序(如A表的ID由大到小排)
:ORDERBYA.IDDESC

