@enkirkby:
You said:
Quote:
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I want to find all books which has the same author
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MCS is for comparing different columns (standard or custom). It can also compare columns to text values (e.g. Jules Verne). It cannot "find all books that have the same author", unless you specify the author's name (e.g. Jules Verne).
Standard Calibre has functionality to "find all books that have the same author".
MCS does what Standard Calibre cannot do.
You should SWAP "sideways", putting your Title parameters on the left. Then, change the middle boolean logic operator to "inactive". That means "inactive for this search; disregard it; just use the parameters on the left side".
Simplifying your parameters may solve your problem.
DaltonST