PROC SQL;update work, test setmarital=case when marital in (2, 4) then 2 end,race=case when race in (3,5,6,7,8) then 7when race in (4) then 9 end;quit; As showing above, I got "martial 2 and 4" changing to 2, but missing 1 and 3 original categories in the updated data.
The same as race, I only got the 7 and 9 in race columns, but missing 1 and 2 original rows in the updated table.
After each exercise, we provide the solution so you can check your answer.
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If you set a column to the value it currently has, My SQL notices this and does not update it.
If you update a column that has been declared , an error occurs if strict SQL mode is enabled; otherwise, the column is set to the implicit default value for the column data type and the warning count is incremented.
This option takes a list of one or more partitions or subpartitions (or both).
UPDATE some_table SET column_x = CASE WHEN x_specific_condition THEN new_value_for_x ELSE column_x END, column_y = CASE WHEN y_specific_condition THEN new_value_for_y ELSE column_y END, WHERE some_more_conditions Problem with above is, each column (x, y) still gets updated with their own value if some_more_conditions return true irrespective of their specific conditions returning true.
What is the SQL update syntax to update more than one column?
Answer: The landmark book "Advanced Oracle SQL Tuning The Definitive Reference" is filled with valuable information on Oracle SQL Tuning.
These exercises allow you to try out your skills with the UPDATE statement.
You will be given questions that you need to solve.