Question

I need to make the string/varchar variable with value 20061212 to be string/varchar value 2006-12-12 00:00:00

I can’t find the right SQL syntax code to make it happened in SQL Server.

The code can be created as stored procedure or similar in SQL Server.

Answer 1

SELECT
  LEFT(@string, 4)
  + '-' + SUBSTRING(@string, 5, 2)
  + '-' + SUBSTRING(@string, 7, 2)
  + ' 00:00:00'

You could cast your string to a DATETIME and then convert it back to a string in your chosen format. But that would likely be slower than this more explicit option.

SELECT
  CONVERT(VARCHAR(19), CAST(@string AS DATETIME), 120)