oralce写法：
select WM_CONCAT(A.title) as citys from tmpcity A
sql server写法：
select stuff((select ','+A.title from tmpCity A FOR xml PATH('')), 1, 1, '') as citys
mysql写法：
select GROUP_CONCAT(A.title) as citys from tmpcity A; --默认的逗号分隔
select GROUP_CONCAT(A.title SEPARATOR ' ') as citys from tmpcity A; --用空格分隔
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