The protect property is written in IF (ISNULL (another column name), 0, 1),
Of course, if you ask for numbers 0 or empty strings, as null
Can be written into IF (isnull (another column name) or another column name = 0, 0, 1), if (ISNULL (another column name) OR another column name = '', 0, 1) perform this setting Specific operation is
1 Data Window Design Interface Select the column to set
2 to the property bar find protect
3 points next to Protect, the pop-up window tells your expression to write it, determine
4 Save Description: After writing the expression, the red icon on the button will become a green icon.
