Hi @zz ,
The linest excel function is just linear regression. It's (still) not available in sql server.
For the Decision Functions：
Commonly used conditional functions in SSRS are IIF, Switch and Choose.
=IIf ( <condition> , <return value if true> , <return value if flase> ) =Switch(<condition>, <return value if true>, <next condition>, <return value if true>, ...)
For the length issue:
If your field is not a string, try converting first by using the Cstr function:
= LEN( Cstr(Fields!YourField.Value) ) = Cstr(Fields!YourField.Value).Length
For more information. please refer to: Expression examples in paginated reports (Report Builder).
The use of functions usually depends on your report design and data. So please share screenshots of your designs if possible. You could also try the functions I provided above.
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