SQL：如何基于 GETDATE() 函数以 YYYYMM 格式获取上个月的整数值

Question

For example, if the todays date is 1/30/2019, I'd like to use the GETDATE() Function to return that date and set it equal to [Current_Date]. I'd then like to use the current date to assign the value of 201912 to the variable @SETMONTH that I've declared as an Integar. Any help with code that is capable of doing this would be much appreciated.

@SETMONTH INT

--To assign a value to [Current_Date]

SELECT 
    CONVERT(DATE, GETDATE()) [Current_Date]


UPDATE Table1

SET

Model_Month = --This is where I need a formula that can convert the date of 1/30/2020 to 201912

Answer 1

You can use EOMONTH() :

SELECT CONVERT(VARCHAR(6), EOMONTH(GETDATE(), -1), 112);

So, the update statement would looks like :

DECLARE @SETMONTH INT

SELECT @SETMONTH = CONVERT(VARCHAR(6), EOMONTH(GETDATE(), -1), 112)

UPDATE table1
      SET Model_Month = @SETMONTH