What are the uses of the different join operations in SQL? Like I want to kno开发者_运维百科w why do we need the different inner and outer joins?The only type of join you really need is LEFT OUTER JOI
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I will build a system where I wan开发者_高级运维t to reduce single-point-of-failures, and I need a database. Is there any (free) relational database systems that can handle multi-master setups good (i
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I\'m considering storing the content of a web a开发者_如何转开发pp in an RDF or OWL ontology instead of an RDBMS.
I need some advice regarding multiple records. I have a table with fields username,message and 开发者_如何学运维message_to. The scenario could be sending the same message to multiple users in one go.
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What is the best way of handling many-to-many relations in a RDBMS database like mySQL? Have tried using a pivot table to keep track of the relationships, but it leads to either one of the following:
I wonder if there is a canonical way to conve开发者_C百科rt data from long to wide format in SQLite (is that operation usually in the domain of relational databases?). I tried to follow this example f
I have a table in which I need both the values to be primary because I am referencing this combination as foreign key in the other tables. Table definition and the data I need to put are as follows
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