ALTER TABLE "odsws"."gateway_execute_time" ADD CONSTRAINT

根据提供的引用内容，ALTER TABLE "odsws"."gateway_execute_time" ADD CONSTRAINT是一个SQL语句，用于在"odsws"数据库的"gateway_execute_time"表中添加约束。具体的约束类型和约束条件没有提供，所以无法给出具体的答案。
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