Usage of CONVERT conversion function in SQL

Format:
CONVERT(data_type,expression[,style])

Explanation:
This style is generally used when converting time types (datetime, smalldatetime) and string types (nchar, nvarchar, char, varchar)
to.

Example:
SELECT CONVERT(varchar(30),getdate(),101) now
The result is:
now
--------------------- ------------------
|09/15/2001

======================== ============================================

style numbers are converting The meaning of time is as follows:

--------------------------------------------- -------------------------------------------------- ----------------
Style (2 digits represent the year) | Style (4 digits represent the year) | Input and output formats -------------------------------------------------- ------------------------------------------------
0                                                                                 mon dd yyyy hh:miAM(or PM)                                                                                               -------------------------------------------------- -------------------
1                                                                                                      -------------------------------------------------- ---------------------------------------
2                                                                                                                       
------------------------------------------------- -------------------------------------------------- ----------
3                                                                                                                                                              -------------------------------------------------- --------------------------
4                                                                                                                      -------------------------------------------------- --------------------------------------------------
5                               |  105    意大利             |   dd-mm-yy                                        
------------------------------------------------------------------------------------------------------------
6                               |  106                            |   dd mon yy                                        
------------------------------------------------------------------------------------------------------------
7                               |  107                            |   mon dd,yy                                        
------------------------------------------------------------------------------------------------------------
8                               |  108                            |   hh:mm:ss                                         
------------------------------------------------------------------------------------------------------------
9                               |  109                            |   mon dd yyyy hh:mi:ss:mmmmAM(或PM)
------------------------------------------------------------------------------------------------------------
10                             |  110    美国                 |   mm-dd-yy                                         
------------------------------------------------------------------------------------------------------------
11                             |  111    日本                 |   yy/mm/dd                                        
------------------------------------------------------------------------------------------------------------
12                                                                                                                                                                           -------------------------------------------------- ---------------
13                                                                                                                                                                                                                                                                                        since -------------------------------------------------- --------------------------------------------------
14                                                                                           114                                                                                                                                                             -------------------------------------------------- -----------------------
20                             |  120     ODBC 规范     |    yyyy-mm-dd hh:mi:ss(24小时制)         
---- -------------------------------------------------- -------------------------------------------------- ----
21                                                                                                                                                                                                        -------------------------------------------------- ----------------------------------

Statement and query results:
SELECT CONVERT(varchar(100) , GETDATE(), 0): 05 16 2006 10:57AM
SELECT CONVERT(varchar(100), GETDATE(), 1): 05/16/06
SELECT CONVERT(varchar(100), GETDATE(), 2) : 06.05.16
SELECT CONVERT(varchar(100), GETDATE(), 3): 16/05/06
SELECT CONVERT(varchar(100), GETDATE(), 4): 16.05.06
SELECT CONVERT(varchar( 100), GETDATE(), 5): 16-05-06
SELECT CONVERT(varchar(100), GETDATE(), 6): 16 05 06
SELECT CONVERT(varchar(100), GETDATE(), 7): 05 16, 06
SELECT CONVERT(varchar(100), GETDATE(), 8): 10:57:46
SELECT CONVERT(varchar(100), GETDATE(), 9): 05 16 2006 10:57:46: 827AM
SELECT CONVERT(varchar(100), GETDATE(), 10): 05-16-06
SELECT CONVERT(varchar(100), GETDATE(), 11): 06/05/16
SELECT CONVERT(varchar(100 ), GETDATE(), 12): 060516
SELECT CONVERT(varchar(100), GETDATE(), 13): 16 05 2006 10:57:46:937
SELECT CONVERT(varchar(100), GETDATE(), 14 ): 10:57:46:967
SELECT CONVERT(varchar(100), GETDATE(), 20): 2006-05-16 10:57:47
SELECT CONVERT(varchar(100), GETDATE(), 21) : 2006-05-16 10:57:47.157
SELECT CONVERT(varchar(100), GETDATE(), 22): 05/16/06 10:57:47 AM
SELECT CONVERT(varchar(100), GETDATE() , 23): 2006-05-16
SELECT CONVERT(varchar(100), GETDATE(), 24): 10:57:47
SELECT CONVERT(varchar(100), GETDATE(), 25): 2006-05- 16 10:57:47.250
SELECT CONVERT(varchar(100), GETDATE(), 100): 05 16 2006 10:57AM
SELECT CONVERT(varchar(100), GETDATE(), 101): 05/16/2006
SELECT CONVERT(varchar(100), GETDATE(), 102): 2006.05.16
SELECT CONVERT(varchar(100), GETDATE(), 103): 16/05/2006
SELECT CONVERT(varchar(100), GETDATE(), 104): 16.05.2006
SELECT CONVERT(varchar(100), GETDATE(), 105): 16-05-2006
SELECT CONVERT(varchar(100), GETDATE(), 106): 16 05 2006
SELECT CONVERT(varchar(100), GETDATE(), 107): 05 16, 2006
SELECT CONVERT(varchar(100), GETDATE(), 108): 10:57:49
SELECT CONVERT(varchar(100), GETDATE(), 109): 05 16 2006 10:57:49:437AM
SELECT CONVERT(varchar(100), GETDATE(), 110): 05-16-2006
SELECT CONVERT(varchar(100), GETDATE(), 111): 2006/05/16
SELECT CONVERT(varchar(100), GETDATE(), 112): 20060516
SELECT CONVERT(varchar(100), GETDATE(), 113): 16 05 2006 10:57:49:513
SELECT CONVERT(varchar(100), GETDATE(), 114): 10:57:49:547
SELECT CONVERT(varchar(100), GETDATE(), 120): 2006-05-16 10:57:49
SELECT CONVERT(varchar(100), GETDATE(), 121): 2006-05-16 10:57:49:000