SQL DOM: Compile Time Checking of Dynamic SQL Statements
... Misspellings such as this should be caught during unit testing and the example we have shown most likely would be caught at that time. However, SQL strings are often not that simple, as we will see in the next example. In Figure 3 we see a common example of a function that uses string concatenation ...
... Misspellings such as this should be caught during unit testing and the example we have shown most likely would be caught at that time. However, SQL strings are often not that simple, as we will see in the next example. In Figure 3 we see a common example of a function that uses string concatenation ...
DBMS Lab
... Department table. But, in the Employee table all the employee records are from the first four departments only. Now a join operation on these two tables would retrieve only those rows where the department numbers are matching, i.e. either of those departments where some employee has been recruited. ...
... Department table. But, in the Employee table all the employee records are from the first four departments only. Now a join operation on these two tables would retrieve only those rows where the department numbers are matching, i.e. either of those departments where some employee has been recruited. ...
SQL Server Stored Procedures
... since Version 4.21a, enjoying a reputation as one of the best "SQL Gurus" in the country He has taught the Administration, Development, Data Warehousing and Performance Tuning courses since 1995 in the Australasia-Pacific region and provided consultancy services to companies like the University of N ...
... since Version 4.21a, enjoying a reputation as one of the best "SQL Gurus" in the country He has taught the Administration, Development, Data Warehousing and Performance Tuning courses since 1995 in the Australasia-Pacific region and provided consultancy services to companies like the University of N ...
by Lester Knutsen - Advanced DataTools
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
SQL DB - Amazon Web Services
... http://download.microsoft.com/download/2/7/0/270B6380-8B38-4268-8AD0-F480A139AB19/SQL2008R2_LicensingQuickReference-updated.pdf ...
... http://download.microsoft.com/download/2/7/0/270B6380-8B38-4268-8AD0-F480A139AB19/SQL2008R2_LicensingQuickReference-updated.pdf ...
Chapter 1
... in a database, storing their definitions in a data dictionary. An example DDL command is the CREATE TABLE command. DDL allows the user to create, drop, and alter a database object, and to grant and revoke privileges on a database object. Data Manipulation Language (DML): A set of SQL commands that ...
... in a database, storing their definitions in a data dictionary. An example DDL command is the CREATE TABLE command. DDL allows the user to create, drop, and alter a database object, and to grant and revoke privileges on a database object. Data Manipulation Language (DML): A set of SQL commands that ...
Title of Course
... Null values are the “absence of information”. They are logical values and represent “not/available” …or… “not/applicable” status for a field If you accept the default setting for SQL nulls as generated by the Data Access wizard, EGL internally maintains a null indicator for each variable that has th ...
... Null values are the “absence of information”. They are logical values and represent “not/available” …or… “not/applicable” status for a field If you accept the default setting for SQL nulls as generated by the Data Access wizard, EGL internally maintains a null indicator for each variable that has th ...
SELECT Statements in PL/SQL
... single row in a PL/SQL block. The data retrieved by the SQL statement should be held in variables using the INTO clause. Where Does Oracle Process SQL Statements? The Oracle server allocates a private memory area called the context area for processing SQL statements. The SQL statement is parsed and ...
... single row in a PL/SQL block. The data retrieved by the SQL statement should be held in variables using the INTO clause. Where Does Oracle Process SQL Statements? The Oracle server allocates a private memory area called the context area for processing SQL statements. The SQL statement is parsed and ...
select
... • It is possible for tuples to have a null value, denoted by null, for some of their attributes • null signifies an unknown value or that a value does not exist. • The result of any arithmetic expression involving null is null – Example: 5 + null returns null ...
... • It is possible for tuples to have a null value, denoted by null, for some of their attributes • null signifies an unknown value or that a value does not exist. • The result of any arithmetic expression involving null is null – Example: 5 + null returns null ...
Enterprise console
... Comprehensive – physical, virtual, availability groups, Tempdb, query wait stats Enterprise console – real-time view of all SQL activity and performance data Automated and predictive alerts – know when problems occur or can occur ...
... Comprehensive – physical, virtual, availability groups, Tempdb, query wait stats Enterprise console – real-time view of all SQL activity and performance data Automated and predictive alerts – know when problems occur or can occur ...
... Blackfish SQL is fully integrated with CodeGear RAD Studio, Delphi, C++Builder and Delphi Prism; and supports Delphi, Delphi Prism, C#, or VB language stored procedures. Developers can use RAD Studio's Data Explorer to easily manage their Blackfish databases. In addition, RAD Studio includes power m ...
Introduction to Databases
... The Oracle Transparent Network Substrate (TNS) implements an application layer of the OSI model. Users connect through TNS to the database using TCP sockets or IPC connections. Clients use the tnsnames.ora file like a host file, and map machine names to a combination of IP and port address. ...
... The Oracle Transparent Network Substrate (TNS) implements an application layer of the OSI model. Users connect through TNS to the database using TCP sockets or IPC connections. Clients use the tnsnames.ora file like a host file, and map machine names to a combination of IP and port address. ...
Embedded SQL in a C Program
... • API: dynamic database programming with a library of functions • Advantage: no preprocessor needed (thus more flexible) • Disadvantage • SQL syntax checks to be done at run-time • Sometimes requires more complex programming to access query results because the number of attributes and their types in ...
... • API: dynamic database programming with a library of functions • Advantage: no preprocessor needed (thus more flexible) • Disadvantage • SQL syntax checks to be done at run-time • Sometimes requires more complex programming to access query results because the number of attributes and their types in ...
Chapter 4: SQL
... Note that we do not need to use the having clause, since we compute the temporary (view) relation result in the from clause, and the attributes of result can be used directly in the where clause. ...
... Note that we do not need to use the having clause, since we compute the temporary (view) relation result in the from clause, and the attributes of result can be used directly in the where clause. ...
branch-name
... Note: predicates in the having clause are applied after the formation of groups whereas predicates in the where clause are applied before forming groups ...
... Note: predicates in the having clause are applied after the formation of groups whereas predicates in the where clause are applied before forming groups ...
Null Semantics for Subqueries and Atomic Predicates
... evaluate its miserable logical value have been proposed including multi-valued logic such as 3-valued logic in [18], and 4-valued logic in [9], [4] and others. Its effects are still recently discussed in various issues of database such as normalization in [13] providing axiomatization to normalize d ...
... evaluate its miserable logical value have been proposed including multi-valued logic such as 3-valued logic in [18], and 4-valued logic in [9], [4] and others. Its effects are still recently discussed in various issues of database such as normalization in [13] providing axiomatization to normalize d ...
Avoiding SQL Performance Regressions - Oracle DBA
... • SPA Report showed very few query improvements(6) and regressions(9) • Plan changes in both improvement and regression categories very negligible • About 2000 queries changed plans but performance remained the same – good news… ...
... • SPA Report showed very few query improvements(6) and regressions(9) • Plan changes in both improvement and regression categories very negligible • About 2000 queries changed plans but performance remained the same – good news… ...
Workhops_8_Jul_DB_development_tools_JW - Indico
... http://www.benthicsoftware.com • It is commercial software, the license keys are located at DFS, can be used by anybody on the ...
... http://www.benthicsoftware.com • It is commercial software, the license keys are located at DFS, can be used by anybody on the ...
Structured Query Language Injection
... the Web site executes a database command with a specific intent. The success of an SQL injection exploit varies based on several factors that we will explore later. At their worst, SQL injection exploits change a database command from the developer’s original intent to an arbitrary one chosen by the ...
... the Web site executes a database command with a specific intent. The success of an SQL injection exploit varies based on several factors that we will explore later. At their worst, SQL injection exploits change a database command from the developer’s original intent to an arbitrary one chosen by the ...
Interacting with the Oracle Server
... • Retrieve the current row values into variables • Include the same number of variables • Match each variable to correspond to the columns positionally • Test to see whether the cursor contains rows ...
... • Retrieve the current row values into variables • Include the same number of variables • Match each variable to correspond to the columns positionally • Test to see whether the cursor contains rows ...
(PPT, Unknown)
... programmer's perspective is its relative compatibility with SQL (structured query language) — queries can be viewed Graphical user interface|graphically or edited as SQL statements, and SQL statements can be used directly in Macros and VBA Modular programming|Modules to manipulate Access tables ...
... programmer's perspective is its relative compatibility with SQL (structured query language) — queries can be viewed Graphical user interface|graphically or edited as SQL statements, and SQL statements can be used directly in Macros and VBA Modular programming|Modules to manipulate Access tables ...
New SQL Features in Firebird
... Regular expressions support per SQL standard specification New SIMILAR TO predicate More powerful version of LIKE with regexp syntax Example : is given string represents a valid number ? Value SIMILAR TO '[\+\-]?[0-9]*([0-9].|.[0-9])?[[:DIGIT:]]*' ESCAPE '\' ...
... Regular expressions support per SQL standard specification New SIMILAR TO predicate More powerful version of LIKE with regexp syntax Example : is given string represents a valid number ? Value SIMILAR TO '[\+\-]?[0-9]*([0-9].|.[0-9])?[[:DIGIT:]]*' ESCAPE '\' ...
Null (SQL)
Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL Null serves to fulfill the requirement that all true relational database management systems (RDBMS) support a representation of ""missing information and inapplicable information"". Codd also introduced the use of the lowercase Greek omega (ω) symbol to represent Null in database theory. NULL is also an SQL reserved keyword used to identify the Null special marker.For people new to the subject, a good way to remember what null means is to remember that in terms of information, ""lack of a value"" is not the same thing as ""a value of zero""; similarly, ""lack of an answer"" is not the same thing as ""an answer of no"". For example, consider the question ""How many books does Juan own?"" The answer may be ""zero"" (we know that he owns none) or ""null"" (we do not know how many he owns, or doesn't own). In a database table, the column reporting this answer would start out with a value of null, and it would not be updated with ""zero"" until we have ascertained that Juan owns no books.SQL null is a state (unknown) and not a value. This usage is quite different from most programming languages, where null means not assigned to a particular instance.