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1 | Less than | dat < 1990 retrieves items published before 1990 |
2 | Less than or equal | dat <= 1990 retrieves items published up to and including 1990 |
3 | Equal | dat = 1990 retrieves items published in 1990 |
4 | Greater or equal | dat >= 1990 retrieves items published in and after 1990 |
5 | Greater than | dat > 1990 retrieves items published after 1990 |