如何从列 SQL 中删除/更改日期格式

Question

I am a below beginner when it comes to SQL. I am using SQL JOIN to join two tables and dump that data into a output file.

One of the tables(EMPLOYEE) has a column(BIRTHDAY) and on the output file it prints YY-MM-DD-MM-SS-MM format.

I only want to see YY_MM_DD format in my output file. I do not want to change the data or anything in SQL data base, as I am just reading it.

Here is my SQL command I run on cmd line:

sqlcmd -Q "Use GlobalStore select * from  EMPLOYEE Inner JOIN ADDRESS ON Address.ADDR_ID = Employee.EMP_ID " -s ";" -o D:\output.txt

Please note that I need to do this on Win7 cmd line. Can someone please help me?

Answer 1

Instead of using wildcard selection in your command text like select * from EMPLOYEE , you have to specify explicitly column names to select, and convert BIRTHDAY column value to string something like

select
    replace(convert(nvarchar(10), BIRTHDAY, 2), '.', '_') as BIRTHDAY,
    .... the rest of columns
from  EMPLOYEE
.... the rest of your query

Here convert(nvarchar(10), BIRTHDAY, 2) actually converts datetime value to the string using format yy.mm.dd and then replace function replaces dots to underscores to achieve your desired YY_MM_DD format.