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I have three columns. "Site ID" with a value, "Ready" with date and "Installation Completed" with date.

Now I want that I search whole column B for non-blank cell, if I found then it checks column C is blank, if column B is blank then write value of Column A in Column D where I am writing formula otherwise move to search for next non-blank value in Column B.

Hope you understand and help me with solution.

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What would the argument be for column C "Installation Complete"? So if B is blank, is there a need to check c? If there is, would you want a notice like "Ready Date Missing" to appear in column d? – Carl B Aug 12 '12 at 5:32

Assuming "Site ID" is column A, "Ready" is B, and "Installation Complete" is C. You could use the following formula in column D and then copy it down as many rows as you need.

=IF(ISBLANK(B2),"",IF(ISBLANK(C2), A2,""))

This checks to see if cell B2 is blank and if so, does nothing else. If B2 has a value it will then check C2 for a value. If there is nothing in C2 it will show the value of A2.

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