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Bài 2. Các phép toán đại số quan hệ
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Oâm ?. Læl pníp tiæ` ĖẦm sỖ quf` nỊ
@ờm hu`j
6. Cnæm `mỊe ĖẦm sỖ quf` nỊ
?. Læl pníp tiæ` ĖẦm sỖ quf` nỊ
6. Cnæm `mỊe ĖẦm sỖ quf` nỊ
Xëe Ėểf lnọ lỪf nì`j lü sỖ nmỊu \6
ĒƲf rf læl oờ lỪf \ lü sỖ nmỊu \
5\6
ĒƲf rf jmæ trể lỪf tnuờl tå`n Lmty lỪf læl oờ `ây
\\#\@FED\XFXT\LMX]\6Ný`j?2N@\?Kf`62NX\