My first thought was to do this in two queries: one would sum "A" for the whole of the first table; the other would be a straightforward join of tables 1 and 2 and sum "A" where ThingID is common to both; the difference between the two results is what I want. Then I found out...
Displays information in a tree format for databases, domains, and attributes Easily view domain contents via context menu optionsAmazon SimpleDB SQL Editor Edit and run SQL scripts and queries using the SimpleDB select query options and the additional SQL syntax supported by RazorSQL for inserting,...
SQL–SimpleQueries SQL–SimpleQueries Chapter3.1V3.0 Copyright@NapierUniversityDrGordonRussell Introduction •SQListheStructuredQueryLanguage•ItisusedtointeractwiththeDBMS•SQLcan –CreateSchemasintheDBMS–AlterSchemas–Adddata–Removedata–Changedata–AccessData DSL •SQLisaDataSubLanguage–DSL•This...
That would especially be true if you're writing queries or programs that should work on more than one DBMS. You're most likely toencounter one of the DBMSs with the largest market shares (based on figures for the year 2000):Oracle 33.8%IBM 30.1% (prior to acquisition of Informix)...
tombstones are not cleaned quickly enough, and can cause queries to fail (because of tombstone_fail_threshold) or nodes to be overloaded (because of the processing overhead). In these cases, there are a few ways to clean them aggressively (at the cost of using more system resources while ...
In more complex queries, of course, once this transformation has been done the optimizer may find ways other parts of the query can be transformed with the different query blocks embedded in this UNION ALL view. Again, this may cause some surprises when an upgrade takes you from Concatenation...
cases TCP connectivity is an insufficient check. E.g. for HTTP server it is important to be able to serve web pages and for DBMS server - to be able to execute queries. Watchdog module implements asynchronous monitoring of destinations via backends made to check particular service availability....
zeeSQL allows searching Redis hashes by values, making much simpler to express complex queries.Copy> ZEESQL.INDEX DB NEW PREFIX products:* TABLE products SCHEMA id INT price INT name STRING OK > HMSET products:123 id 123 price 2345 name "set of glasses" OK >...
When the default stats collection runs some time late at night the only values in the table are ‘C’ and ‘X’, but when the queries run in the daytime the only values we’re interested are exactly the ones that weren’t there when the stats were collected. Even with a 100% sample...
In the event of a query error, an RDO::Exception is raised, which should include any error messaage provided by the DBMS. Performing read queries There is no difference in the interface for reads or writes. Just call the #execute method in both cases. This always returns an RDO::Result...