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VARCHAR(MAX),它的最大长度可以达到2G
注意：VARCHAR和VARCHAR(MAX)混在一起做处理时还是会变成VARCHAR，从而可能被截断，所以需要全转成VARCHAR(MAX)

DECLARE @ControlAccountS VARCHAR(MAX)
SET @ControlAccountS = ”
SET @ControlAccountS = REPLICATE(CONVERT(VARCHAR(MAX),’b’),8500)
PRINT LEN(@ControlAccountS)