Select the table to be edited,【right click】->【Properties】->【Columns】->【Customize Columns and Filter】->【Comment】->【OK 】
Or use the shortcut key
【Right click】->【Properties】->【Columns】->【Ctrl+U】->【Comment】->【OK】
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Select the table to be edited, [right-click]->[Properties]->[Columns]->[Customize Columns and Filter]->[Comment]- >【OK】
Or use the shortcut key
【Right key】->【Properties】->【Columns】->【Ctrl+U】->【Comment】->【OK】