First, write the correct sql statement in navicat's [Query Editor] (Recommended tutorial: navicat tutorial)
After we finish writing the SQL statement in the [Query Editor], click the [Run] button to use the sql statement. It's the green icon on the upper left.
Then an "impact" message like this will pop up, indicating that it is running.
#Then remember to refresh the table. Right-click on the table to refresh.
At this time you can see that the SQL statement works, go and practice it!
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