小编bag*_*ere的帖子

python中哪个字符串实现更pythonic？

string += "<%s>%s</%s>%s" % (a, b, c, d)

要么

string += '<' + a + '>' + b + '<'/' + c + '>' + d

我想问问是否可以将CASE语句直接写入WHERE子句（我知道WHERE子句也可以通过字符串传递），例如 

 SELECT * FROM db_table INTO TABLE @mt_table[]
     WHERE key1 = @l_key1
          AND key2 = @l_key2
          AND key3 = @l_key3
          AND key4 = @l_key4
          AND ( WHEN l_auth = 'A' THEN username = @sy-uname
                WHEN l_auth = 'U' THEN username = @sy-uname OR username = @space 
                END ).