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The oracle database queries the maximum value of each class based on the category and adds the method to the original result set. The maximum value of oracle

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The oracle database queries the maximum value of each class based on the category and adds the method to the original result set. The maximum value of oracle

You can query the maximum value of each category by category directly by group:

The following data:

Query the maximum value of the index (TEST_INDEX) of each category (TEST_TYPE:

Query Result set:

To query the preceding result set along with the original data in figure 1, use the following SQL statement:

The result is as follows:

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