حل تشریحی سوال شماره 143 پایگاه داده

$A\left(\underline{al},a2,bl,\underline{rl}\right)B\left(\underline{bl},b2,cl,\underline{r3}\right)C\left(\underline{cl},c2,al,\underline{r2}\right)$

$A\left(\underline{al},a2\right)B\left(\underline{bl},b2,al,rl\right)C\left(\underline{cl},c2,bl,r3\right)R1\left(al,\underline{bl},rl\right)R3\left(bl,\underline{cl},r3\right)$

$A\left(\underline{al},a2\right)B\left(\underline{bl},b2\right)C\left(\underline{cl},c2\right)R1\left(\underline{al},\underline{bl},rl\right)R2\left(\underline{al},\underline{cl},r2\right)R3\left(\underline{bl},\underline{cl},r3\right)$