ppt
... Specifying Constraints in SQL Basic Retrieval Queries in SQL INSERT, DELETE, and UPDATE Statements in SQL Additional Features of SQL ...
... Specifying Constraints in SQL Basic Retrieval Queries in SQL INSERT, DELETE, and UPDATE Statements in SQL Additional Features of SQL ...
Product
... Relation Schema: Column headings: relation name + attribute names + attribute types Product(VarChar PName, real Price, VarChar Category, VarChar Manfacturer) often types are left off: Product(PName, Price, Category, Manfacturer) Relation instance: The values in a table. Database Schema: a set of rel ...
... Relation Schema: Column headings: relation name + attribute names + attribute types Product(VarChar PName, real Price, VarChar Category, VarChar Manfacturer) often types are left off: Product(PName, Price, Category, Manfacturer) Relation instance: The values in a table. Database Schema: a set of rel ...
CS 361-001 Database Systems, Dr. Wing Huen
... 1. it is not handed in by the final due date, or 2. it is not a reasonable attempt to solve the assigned problem The course grade will be reduced by three letter grades (e.g. C to F) if you hand in a program which is not your own work or your team’s work if you choose to form a twoperson team. An as ...
... 1. it is not handed in by the final due date, or 2. it is not a reasonable attempt to solve the assigned problem The course grade will be reduced by three letter grades (e.g. C to F) if you hand in a program which is not your own work or your team’s work if you choose to form a twoperson team. An as ...
Lecture 6: SQL II - NYU Computer Science
... CREATE TABLE Sailors plus number of If sailors is empty sailors is < 100 ...
... CREATE TABLE Sailors plus number of If sailors is empty sailors is < 100 ...
ppt
... Select-from-where Subqueries Aggregation Nulls Outer joins Database modifications (insert/delete) ...
... Select-from-where Subqueries Aggregation Nulls Outer joins Database modifications (insert/delete) ...
Introduction to Database Systems
... Final Test [40%] It is mandatory to maintain at least 75% class attendance to be allowed to sit in Final Test. ...
... Final Test [40%] It is mandatory to maintain at least 75% class attendance to be allowed to sit in Final Test. ...
File - Excel
... needs to be created between two tables by referencing foreign key with the primary key of another table. What are the advantages and disadvantages of primary key and foreign key in SQL? Primary key Advantages 1) It is a unique key on which all the other candidate keys are functionally dependent Disa ...
... needs to be created between two tables by referencing foreign key with the primary key of another table. What are the advantages and disadvantages of primary key and foreign key in SQL? Primary key Advantages 1) It is a unique key on which all the other candidate keys are functionally dependent Disa ...
lecture slides - Database Group
... – used by the database application – declarative: we only describe what we want to retrieve – based on tuple relational calculus • Important in logic-based optimizations ...
... – used by the database application – declarative: we only describe what we want to retrieve – based on tuple relational calculus • Important in logic-based optimizations ...
Chapter 20
... Choice of Decompositions (Contd.) The following ICs were given to hold: JP C, SD P, C is the primary key. Suppose that, in addition, a given supplier always charges the same price for a given part: SPQ V. If we decide that we want to decompose CSJDPQV into BCNF, we now have a third choice: ...
... Choice of Decompositions (Contd.) The following ICs were given to hold: JP C, SD P, C is the primary key. Suppose that, in addition, a given supplier always charges the same price for a given part: SPQ V. If we decide that we want to decompose CSJDPQV into BCNF, we now have a third choice: ...
Even more SQL
... WHERE store = “The Bon Marche” If we make the following insertion: INSERT INTO bon-purchase VALUES (“the Bon Marche”, Joe, “Denby Mug”) We can simply add a tuple (“the Bon Marche”, Joe, NULL, “Denby Mug”) to relation Purchase. ...
... WHERE store = “The Bon Marche” If we make the following insertion: INSERT INTO bon-purchase VALUES (“the Bon Marche”, Joe, “Denby Mug”) We can simply add a tuple (“the Bon Marche”, Joe, NULL, “Denby Mug”) to relation Purchase. ...
USING SQL QUERIES TO INSERT, UPDATE, DELETE, AND VIEW
... table1.joinfield = table2.joinfield AND search_condition(s); • If tables share field names, must prefix field in select with table name (table1.field1, table2.field1) • Join condition: part of where clause indicating how tables are related (table1.foreign_key = table2.primary key) • Search condition ...
... table1.joinfield = table2.joinfield AND search_condition(s); • If tables share field names, must prefix field in select with table name (table1.field1, table2.field1) • Join condition: part of where clause indicating how tables are related (table1.foreign_key = table2.primary key) • Search condition ...
Reading Report 2 - Informatics Homepages Server
... (1) Build an access plan for every table involved in the query. If Table A is replicated at sites S1 and S2, enumerate scan(A, S1) and scan(A, S2) as alternative access plans for Table A. (2) Enumerate all two-way join plans using the access plans as building blocks. also enumerate alternative join ...
... (1) Build an access plan for every table involved in the query. If Table A is replicated at sites S1 and S2, enumerate scan(A, S1) and scan(A, S2) as alternative access plans for Table A. (2) Enumerate all two-way join plans using the access plans as building blocks. also enumerate alternative join ...
pdf version
... Today’s lab looks at an additional component of the Data Services layer: formulating queries that select, project and join up data from different tables. Access uses a GUI called the Query-By-Example so users can build queries visually. In the background, Access translates the visually represented q ...
... Today’s lab looks at an additional component of the Data Services layer: formulating queries that select, project and join up data from different tables. Access uses a GUI called the Query-By-Example so users can build queries visually. In the background, Access translates the visually represented q ...
Ch3 - Crystal
... • Ordering of attributes in a relation schema R (and of values within each tuple): – We will consider the attributes in R(A1, A2, ..., An) and the values in each t= to be ordered
– However, a more general definition of relation (which we will
not use) does not require attribute orde ...
... • Ordering of attributes in a relation schema R (and of values within each tuple): – We will consider the attributes in R(A1, A2, ..., An) and the values in each t=
Converting Relational to Graph Databases
... have to retrieve a node n ∈ N (i.e. the label l associated to n) and to insert a new property hAi , vi in n, as performed by the function NewProperty taking as input Ai , r, and g. For instance, when we start to analyze sp4 (i.e., sp1 , sp2 and sp3 were analyzed), we have Ai = TG.tuser and Ai+1 = US ...
... have to retrieve a node n ∈ N (i.e. the label l associated to n) and to insert a new property hAi , vi in n, as performed by the function NewProperty taking as input Ai , r, and g. For instance, when we start to analyze sp4 (i.e., sp1 , sp2 and sp3 were analyzed), we have Ai = TG.tuser and Ai+1 = US ...
Chapter 2 File
... Bolt-ons are used to integrate more functionality to Core ERP Figure 2 -3: Core ERP and ERP Bolt-Ons ...
... Bolt-ons are used to integrate more functionality to Core ERP Figure 2 -3: Core ERP and ERP Bolt-Ons ...
assign2 - Computing Science
... constraints, and participation constraints. You may use the Database Diagram feature to specify foreign key constraints in a graphical way. In addition, impose the following constraints. i. Every department has exactly one manager. ii. Each employee has at most 4 dependents. iii. The total number of ...
... constraints, and participation constraints. You may use the Database Diagram feature to specify foreign key constraints in a graphical way. In addition, impose the following constraints. i. Every department has exactly one manager. ii. Each employee has at most 4 dependents. iii. The total number of ...
The Relational Data Model and Relational Database Constraints
... the ordering of tuples. However, in a file, records are physically stored on disk (or in memory), so there always is an order among the records. This ordering indicates first, second, ith, and last records in the file. Similarly, when we display a relation as a table, the rows are displayed in a cer ...
... the ordering of tuples. However, in a file, records are physically stored on disk (or in memory), so there always is an order among the records. This ordering indicates first, second, ith, and last records in the file. Similarly, when we display a relation as a table, the rows are displayed in a cer ...