Many of the early sewing machines were powered by a treadle mechanism. The treadle was operated by pressing down on it with a foot, or both feet, to cause a rocking movement. This movement spins a large wheel on the treadle frame, connected by a thin leather belt to a smaller driving wheels on the sewing machine.
null. adj. 1. Having no legal force; invalid: render a contract null and void.2.ull. adj. 1. Having no legal force; invalid: render a contract null and void. 2.
What values Null indicators will hold : â -1â : Field is having NULL value. â 0â : Field is Not NULL value. â -2â : Field value is truncated. How /Why to handling Null Values: When processing INSERT or UPDATEâ¦ statements, the database manager checks the null-indicator variable, if one exists.f the column is set to NULL, then the indicator field is used to record this. Using NULL will never save space in a DB2 database design â in fact, it will always add an extra byte for every column that can be.