Explanation: An unqualified column name is. ambiguous if more than one table or view identified in. the FROM clause has a column with that name, or if. more than one column of a nested table expression has. that name.
The exact cause of clubfoot is unknown, but doctors agree that a family history of clubfoot increases the likelihood that a child will be born with the condition. In addition, mothers who smoke and drink during pregnancy are more likely to give birth to a child with a clubfoot or clubfeet.
Pregnancy increases the risk of this disorder in several ways. During pregnancy, the body produces more of the proteins that help blood clot (clotting factors), probably intended to prevent too much bleeding during childbirth. Also, changes during pregnancy cause blood to back up in veins, making clots more likely to form. If the pregnant woman is less mobile, blood is even more likely to back up in leg veins and clot. The clots may interfere with blood flow.