▁data ▁is ▁changed ▁in ▁a ▁mem o ▁field , ▁the ▁block ▁numbers ▁may ▁also ▁change , ▁and ▁the ▁number ▁in ▁the ▁. DB F ▁may ▁be ▁changed ▁to ▁reflect ▁the ▁new ▁location . ▁ ▁Un like ▁d BASE ▁III ▁PL US , ▁if ▁you ▁delete ▁text ▁in ▁a ▁mem o ▁field , ▁d BASE ▁for ▁D OS ▁may ▁reuse ▁the ▁space ▁from ▁the ▁deleted ▁text ▁when ▁you ▁input ▁new ▁text . ▁d BASE ▁I Q ▁PL US ▁always ▁app ended ▁new ▁text ▁to ▁the ▁end ▁of ▁the ▁. db t ▁file . ▁In ▁d BASE ▁III ▁PL US , ▁the ▁. DB T ▁file ▁size ▁grew ▁whenever ▁new ▁text ▁was ▁added , ▁even ▁if ▁other ▁text ▁in ▁the ▁file ▁was ▁deleted . ▁ ▁d BASE ▁ 7 ▁– ▁MS - Windows ▁( Level ▁ 7 ) ▁▁ 7 . 0 ▁b 1 3 4 5 ▁Dec ▁ 1 9 9 7 ▁Full ▁ 3 2 ▁bit ▁version ▁for ▁Win ▁ 9 5 / NT ▁ ▁Level ▁ 7 ▁tables ▁▁ ▁Level ▁ 7 ▁brought ▁many ▁improvements . ▁The ▁field ▁names ▁can ▁have ▁up ▁to ▁ 3 1 ▁characters ▁( from ▁a ▁maximum ▁of ▁ 1 0 ▁before ). ▁Some ▁new ▁fields ▁types ▁have ▁appeared ▁( for ▁example , ▁the ▁auto - increment ▁field ▁that ▁makes ▁nearly ▁impossible ▁to ▁give ▁the ▁same ▁number ▁to ▁two ▁records ▁in ▁the ▁same ▁table ). ▁If ▁your ▁tables ▁have ▁to ▁be ▁used ▁by ▁other ▁software , ▁you ▁might ▁have ▁to ▁sacrifice ▁these ▁advantages ▁for ▁the ▁sake ▁of ▁compatibility