IF NOT EXISTS (SELECT 0 FROM [train_enroll_data] WHERE [courseId] = 636235546473141211)
BEGIN
SELECT CAST(1 AS BIT)
END
ELSE
BEGIN
SELECT CAST(0 AS BIT)
END
SQL判断查询结果是否存在EXISTS
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转载自blog.csdn.net/gdali/article/details/82952494
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