Tests if an attribute equals the given value.
Command Syntax
attr(attribute).in([value])
Usage
const d = new Dynaflo(config);
d.table('Movies')
.query({year: 2015})
.where(attr('actor').in(['Harrison Ford', attr('star_actor')]))
.run()
.then(data => {
// returns all movies with year = 2015 and title = to either 'Harrison Ford' or the value at star_actor
});
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