使用不同的转换为日期格式的SQL查询

Question

Is it possible to convert distinct to dateformat month ?

Column Default Value:

datee value = | tuesday May 6, 2014 |  
              | Monday March 6,2014 |  
              | tuesday June 6, 2014|

My current SQL query:

Select distinct(datee) as dtall from dbalarmnotice.alamnotice order by datee asc;

Output =      | tuesday May 6, 2014 |  
              | Monday March 6,2014 |  
              | tuesday June 6, 2014|


Expected Output =  | May   |  
                   | March |  
                   | June  |

Answer 1

尝试

Select distinct DATENAME(MONTH, datee) as dtall from dbalarmnotice.alamnotice order by datee asc;

Answer 2

Without knowing what SQL you are using.

You can use the following for MSSQL

SELECT distinct datename(mm,datee) as 'dtall' FROM dbalarmnotice.alamnotice order by datee asc;

or without distinct (Better option)

SELECT datename(mm,datee) AS 'dtall' FROM Dbalarmnotice.alamnotice order by datee asc;

I would use an better name than "datee" too.

James

Answer 3

Because in comment you mentioned that you column type is VARCHAR(45) , may be will be better to use string functions .
Of course this will work only if name of the month is between first and second space -character in the date value

SELECT DISTINCT SUBSTRING_INDEX(SUBSTRING_INDEX(datee, ' ', 2), ' ', -1) AS MName
FROM dbalarmnotice.alamnotice

Another approach will be convert string to date and then using MONTHNAME function:

SELECT DISTINCT MONTHNAME(STR_TO_DATE(city, '%W %M %d,%Y')) AS MName
FROM dbalarmnotice.alamnotice