SQLserver data type conversion

1: CAST method

CAST (expression of any valid data type to convert again AS [length data types, optional])

例：SELECT  CAST(10000 as varchar(10))

             SELECT  CAST(10000 as varchar)

2: Convert method

  Convert (to convert the data type of [the length of data types, optional], any valid expression [, its display style, optional])

  例：SELECT CONVERT(datetime,'2017-01-01')

         SELECT CONVERT(varchar, CONVERT(datetime,'2017-01-01'),104)

CAST is the difference Convert and the conversion can be specified style

3: Implicit Data Type Conversion

Example: the SELECT CAST (AS 10000 Money) * CAST (10 AS
int) ----------------
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