CSS122_WINTER09_LECTURE08
... SELECT Title, X.Ratings, Y.Genres FROM Movies M LEFT JOIN (SELECT MovieID, COUNT(Rating) AS Ratings FROM Ratings GROUP BY MovieID) X ON M.MovieID = X.MovieID LEFT JOIN (SELECT MovieID, COUNT(Genre) AS Genres FROM XRefGenresMovies GROUP BY MovieID) Y ON M.MovieID = Y.MovieID; ...
... SELECT Title, X.Ratings, Y.Genres FROM Movies M LEFT JOIN (SELECT MovieID, COUNT(Rating) AS Ratings FROM Ratings GROUP BY MovieID) X ON M.MovieID = X.MovieID LEFT JOIN (SELECT MovieID, COUNT(Genre) AS Genres FROM XRefGenresMovies GROUP BY MovieID) Y ON M.MovieID = Y.MovieID; ...
投影片 1
... records are globally temporally clustered on segments. for snapshot queries, only one segment is used, and for temporal slicing queries, only segments involved are used, thus such queries can be more efficient. ...
... records are globally temporally clustered on segments. for snapshot queries, only one segment is used, and for temporal slicing queries, only segments involved are used, thus such queries can be more efficient. ...
here. - NYU Computer Science
... Use of entity sets vs. relationship sets Possible guideline is to designate a relationship set to describe an action that occurs between entities Binary versus n-ary relationship sets Although it is possible to replace any nonbinary (n-ary, for n > 2) relationship set by a number of distinct bin ...
... Use of entity sets vs. relationship sets Possible guideline is to designate a relationship set to describe an action that occurs between entities Binary versus n-ary relationship sets Although it is possible to replace any nonbinary (n-ary, for n > 2) relationship set by a number of distinct bin ...
Introduction to JDBC Programming
... Holds the pickle image (in the low level storage format) Contains a “values” array of oracle.sql.Datum objects Each attribute is already in its true data type getAttribute() retrieves values array as java.lang.Object[] Casts Struct to oracle.sql.STRUCT to use oracle.sql extensions ...
... Holds the pickle image (in the low level storage format) Contains a “values” array of oracle.sql.Datum objects Each attribute is already in its true data type getAttribute() retrieves values array as java.lang.Object[] Casts Struct to oracle.sql.STRUCT to use oracle.sql extensions ...
107-29: Improving Peformance: Accessing DB2 Data with SAS 9
... SQL. Translation to SQL means that SAS/ACCESS processes the SAS application code and generates the appropriate SQL to access the database. Connecting directly to the database, using the connect statement, allows you to use explicit SQL passthrough. Explicit pass-through is a mechanism that allows yo ...
... SQL. Translation to SQL means that SAS/ACCESS processes the SAS application code and generates the appropriate SQL to access the database. Connecting directly to the database, using the connect statement, allows you to use explicit SQL passthrough. Explicit pass-through is a mechanism that allows yo ...
38. Layered Temporal DBMS`s–Concepts and Techniques
... At the same time, it is widely recognized that temporal data management in SQL–92 is a complicated and error-prone proposition. Updates and queries on temporal data are complex and are thus hard to formulate correctly and subsequently understand (e.g., see [6, 9, 16]). This insight is also not new, ...
... At the same time, it is widely recognized that temporal data management in SQL–92 is a complicated and error-prone proposition. Updates and queries on temporal data are complex and are thus hard to formulate correctly and subsequently understand (e.g., see [6, 9, 16]). This insight is also not new, ...
DBInt2-Indexing
... Leaf with “Perryridge” becomes underfull (actually empty, in this special case) and merged with its sibling. As a result “Perryridge” node’s parent became underfull, and was merged with its sibling Value separating two nodes (at parent) moves into merged node ...
... Leaf with “Perryridge” becomes underfull (actually empty, in this special case) and merged with its sibling. As a result “Perryridge” node’s parent became underfull, and was merged with its sibling Value separating two nodes (at parent) moves into merged node ...
Recovering SQL Server Databases
... DPM expands the basic data protection capabilities included in SQL Server by adding the ability to provide protection for selected databases with more granular control over your recovery time objective (RTO) and recovery point objective (RPO). Using only the tools provided with Windows Server and SQ ...
... DPM expands the basic data protection capabilities included in SQL Server by adding the ability to provide protection for selected databases with more granular control over your recovery time objective (RTO) and recovery point objective (RPO). Using only the tools provided with Windows Server and SQ ...
Logic and Databases
... Equivalence of Relational Algebra and Calculus Theorem: If q is a k-ary query, then the following statements are equivalent: 1. There is a relational algebra expression E such that q(D) = E(D), for every database instance D (in other words, q is expressible in relational algebra). 2. There is a rel ...
... Equivalence of Relational Algebra and Calculus Theorem: If q is a k-ary query, then the following statements are equivalent: 1. There is a relational algebra expression E such that q(D) = E(D), for every database instance D (in other words, q is expressible in relational algebra). 2. There is a rel ...
Performance Tradeoffs in Read-Optimized Databases
... While column-oriented systems often have their own sets of column-wise operators that can provide additional performance benefit to column stores [1], we focus in this paper on the differences between column and row stores related solely to the way data is stored on disk. To this end, we implement b ...
... While column-oriented systems often have their own sets of column-wise operators that can provide additional performance benefit to column stores [1], we focus in this paper on the differences between column and row stores related solely to the way data is stored on disk. To this end, we implement b ...
Oracle SQL
... Can be used to write DDL, DML, TCL commands as Can be used to perform conditional processing well as manage database security (create users, within a program block – If Then Else, Loops, CASE assign privileges/ roles etc.) statements, exception handling etc. ...
... Can be used to write DDL, DML, TCL commands as Can be used to perform conditional processing well as manage database security (create users, within a program block – If Then Else, Loops, CASE assign privileges/ roles etc.) statements, exception handling etc. ...
Table 9-1. Basic SQL to Java Type Mappings
... Yet another alternative to using a Statement object that includes variables by concatenating strings is to use a PreparedStatement instead. A PreparedStatement allows us to embed placeholders for variables in the SQL statement. The placeholders for variables in a PreparedStatement are called bind va ...
... Yet another alternative to using a Statement object that includes variables by concatenating strings is to use a PreparedStatement instead. A PreparedStatement allows us to embed placeholders for variables in the SQL statement. The placeholders for variables in a PreparedStatement are called bind va ...
Querying on GPS Data Using MySQL
... the Amazon rain forest, oil spills in the sea, armies, epidemic diseases, hurricanes, and so forth. In this paper we will work on 3-D (2D+time) moving points. [11] There are two flavors of such databases. The first, which we call the location management perspective, represents information about a se ...
... the Amazon rain forest, oil spills in the sea, armies, epidemic diseases, hurricanes, and so forth. In this paper we will work on 3-D (2D+time) moving points. [11] There are two flavors of such databases. The first, which we call the location management perspective, represents information about a se ...
Introduction to SQL, OleDB interface to Access from VB.NET
... Introduction to SQL, OleDB interface to Access from VB.NET ...
... Introduction to SQL, OleDB interface to Access from VB.NET ...
NTAUG - Dominey
... acceptance stems from its ability to manage all of the necessary database manipulations while remaining relatively easy to learn. English-like command structure makes it readable, while providing for the most complex of database functionality. 40+ SQL statements follow the same basic structure, ...
... acceptance stems from its ability to manage all of the necessary database manipulations while remaining relatively easy to learn. English-like command structure makes it readable, while providing for the most complex of database functionality. 40+ SQL statements follow the same basic structure, ...
Data Concurrency and Consistency
... A useful way to view the read committed and serializable isolation levels in Oracle is to consider the following scenario: Assume you have a collection of database tables (or any set of data), a particular sequence of reads of rows in those tables, and the set of transactions committed at any partic ...
... A useful way to view the read committed and serializable isolation levels in Oracle is to consider the following scenario: Assume you have a collection of database tables (or any set of data), a particular sequence of reads of rows in those tables, and the set of transactions committed at any partic ...
Granice primenljivosti neravnoteznih metoda
... function. This would lead to a large spatial complexity of the database. Most often, this is solved by introducing well known standard types of fuzzy sets (triangular, trapezoidal etc.) as attribute values. If a type of a fuzzy set is introduced, then we only need to store the parameters that are ne ...
... function. This would lead to a large spatial complexity of the database. Most often, this is solved by introducing well known standard types of fuzzy sets (triangular, trapezoidal etc.) as attribute values. If a type of a fuzzy set is introduced, then we only need to store the parameters that are ne ...
Paper on ODBC
... implements the ODBC API and provides information to the application. Microsoft’s driver manager is a dynamic link-library file named odbc32.dll [5]. With Unix, the ODBC driver is a shared library [10]. The database contains all the data that an application needs to access [10]. The client drivers a ...
... implements the ODBC API and provides information to the application. Microsoft’s driver manager is a dynamic link-library file named odbc32.dll [5]. With Unix, the ODBC driver is a shared library [10]. The database contains all the data that an application needs to access [10]. The client drivers a ...
Connection Management Strategies for Java applications
... database configurations, poor tuning and poor understanding of database capabilities. The Oracle database along with the Oracle JDBC drivers and the Oracle Universal Connection Pool (UCP) offer many connection management strategies to improve the quality of services in terms of performance, scalabil ...
... database configurations, poor tuning and poor understanding of database capabilities. The Oracle database along with the Oracle JDBC drivers and the Oracle Universal Connection Pool (UCP) offer many connection management strategies to improve the quality of services in terms of performance, scalabil ...
Structured Query Language - CBSE Plus Two Help Files
... SQL commands consists of English language words such as create, insert , delete etc, so it is easy to learn SQL is a non procedural language. We simply specify what information is to be retrieved rather than how to retrieve it SQL is a keyword based language . Each command of SQL begins with a uniq ...
... SQL commands consists of English language words such as create, insert , delete etc, so it is easy to learn SQL is a non procedural language. We simply specify what information is to be retrieved rather than how to retrieve it SQL is a keyword based language . Each command of SQL begins with a uniq ...
Oblivious Querying of Data with Irregular Structure(cont`d)
... • Different query semantics admit different levels of incompleteness ...
... • Different query semantics admit different levels of incompleteness ...