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"Expression Builder" format of coding
In queries, we use some expressions as follows:
Seniority: (Select Count(*) from Employees Where [HireDate] [EmployHireDate].[HireDate]+1 which are very useful for our desired calculation. These expressions are not meaningful for me, although I can copy-paste and use them but I would like to be able to write them by my own. For example what is the meaning of "Select Count(*)" in above expression? My question is that where can I find the format of these expressions and a basic tutorial about it? Any comment is highly appreciated. TIA, Rasoul Khoshravan Azar Tabriz, Iran |
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