我有一个包含三行的单列表，如下所示：
第 1 列
TEAM1 TEAM2 team3 team4
我想做一个自笛卡尔与结果加入如下： TEAM1，TEAM2 TEAM1，team3 TEAM1，team4 TEAM2，team3 TEAM2，team4 team3，team4
sql database join cartesian
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