Error messages in relational database management systems : a comparison of effectiveness, usefulness, and user confidenceTaipalus, Toni; Grahn, Hilkka; Ghanbari, HadiJournal of systems and software2021 / art. 111034, 15 p.: ill https://doi.org/10.1016/j.jss.2021.111034 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS Evaluation of Different Designs to Represent Missing Information in SQL Databases [Electronic resource]Eessaar, Erki; Saal, ElariCISSE 2011 International joint conferences2011 / [6 p. : ill] [CD-ROM] https://link.springer.com/chapter/10.1007/978-1-4614-3535-8_14