SELECT name, score FROM tests WHERE score < '75' ORDER BY score ASC in Java

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SELECT name, score FROM tests WHERE score < '75' ORDER BY score ASC
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This Select is the same as when no direction was givenTo sort the results descending, use the following:
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SELECT name, score FROM tests WHERE score < '75' ORDER BY score DESC
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Guaranteeing the Existence of Sort Attributes
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Because SimpleDB never enforces any form of required attributes, your sort attribute might not exist in all items that match your query If this were to happen, SimpleDB would not really have a meaningful way to order your search results You could argue that items without the sort attribute should just be included at the end of the results, following the properly sorted results However, inclusion at the end does nothing to solve the ordering problem between those items at the end Moreover, what is worse, if the sort attribute is not in the list of requested attributes, there would be no way of knowing which of the result items had the sort attribute and which did not SimpleDB prevents these issues by only accepting a sort when the accompanying WHERE clause guarantees the presence of the sort attribute Constructing such a WHERE clause is not difficult In fact, merely including the sort attribute in a comparison will usually be sufficient to meet this requirement The preceding example does just this:
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SELECT name, score FROM tests WHERE score < '75' ORDER BY score
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Restricting matches to those items with score less than '75' implicitly requires the attribute to exist
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4 A Closer Look at Select
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Here is a variation that fails this test and returns an InvalidQueryExpression response:
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SELECT name, score FROM tests WHERE score < '75' ORDER BY name
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In order to sort by name, the WHERE clause must guarantee the existence of that attribute In this case, we do not want to add any specific restrictions to the name, so the inclusion of the IS NOT NULL comparison fits well:
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SELECT name, score FROM tests WHERE score < '75' and name IS NOT NULL ORDER BY name
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The IS NOT NULL operator filters out any item from the results that does not have a value for that attribute
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Note
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Even though SimpleDB does not perform any schema enforcement, you may still implement required attributes in your application logic When this is the case, it means you must have gone to the trouble of ensuring that a certain attribute always has a value It can then seem redundant and awkward that now, after having done all that, you must also add another comparison to your query that will always evaluate to true Consider, however, that the SimpleDB service has no way of knowing what your code is doing now, or what someone else might change it to do in the future The sorting in SimpleDB was designed to return a meaningful response in all cases Absent a schema, there needs to be some mechanism to achieve it
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LIMIT Clause
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The final clause in a Select is the optional LIMIT clauseThe function of this clause is to cap the number of results that will come back from a single call to SelectThe syntax for this clause calls for the keyword LIMIT followed by a number from 1 to 2500 Here is an example of LIMIT used in a query:
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SELECT name, score FROM tests WHERE score < '75' LIMIT 5
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Every Select call is subject to limit processing; if you do not include a limit clause, SimpleDB uses the default LIMIT value of 100As the search results list is built during query processing, if the size of the list reaches the limit value, processing stops and the results are returnedWhen this happens, SimpleDB returns a NextToken along with the search resultsThe NextToken is an encoded value that holds the state information necessary to allow processing to continue where it left off without the need for SimpleDB to maintain the state on the back-endThis allows SimpleDB, internally, to handle any query using any node that has a replica of the target domain From the client side, query processing can be resumed by making the same Select call and passing the NextToken The LIMIT clause is most obviously useful in those cases where you truly care about only a certain number of results For instance, when you want the name of the student with the highest test score:
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