This SQL query selects all properties from the alf_node_properties table where the actual type is 21 and left joins the alf_content_data table to get content data by id, filtering where the content data id is null.
The document provides an overview of key concepts in the C programming language, including:
- Data types, variables, constants, and arrays. Arrays must be declared before use with the format data-type variable-name[size]. Two dimensional arrays are supported.
- Storage classes like automatic, external/global, static, and register that determine variable scope, lifetime, and memory location.
- Functions and different ways they can be called in C - call by value where copies of arguments are passed, and call by reference where addresses of variables are passed.
Ragel is a parser generator that compiles to various host languages including Ruby. It is useful for parsing protocols and data formats and provides faster parsing than regular expressions or full LALR parsers. Several Ruby projects like Mongrel and Hpricot use Ragel for tasks like HTTP request parsing and HTML parsing. When using Ragel with Ruby, it can be compiled to Ruby code directly, which is slow, or a C extension can be written for better performance. The C extension extracts the parsed data from Ragel and makes it available to Ruby.
Local variables are declared within functions and only accessible within that function. Their value is not retained between function calls. Global and static variables are accessible from any function in a file. Static variables retain their value between function calls like global variables but are only accessible within the declared function. Variables can also be declared as const to prevent modification or register for potential faster memory access. The scope of variables determines where they are accessible - variables declared within blocks are only accessible within that block.
Una plataforma educativa es una herramienta física, virtual o combinada que permite la interacción entre usuarios con fines pedagógicos y contribuye a la evolución del aprendizaje y la enseñanza. Actualmente, las universidades utilizan plataformas educativas para administrar materiales, exámenes, comunicaciones y más. Existen plataformas comerciales, de código abierto y desarrollo propio.
The document provides an overview of key concepts in the C programming language, including:
- Data types, variables, constants, and arrays. Arrays must be declared before use with the format data-type variable-name[size]. Two dimensional arrays are supported.
- Storage classes like automatic, external/global, static, and register that determine variable scope, lifetime, and memory location.
- Functions and different ways they can be called in C - call by value where copies of arguments are passed, and call by reference where addresses of variables are passed.
Ragel is a parser generator that compiles to various host languages including Ruby. It is useful for parsing protocols and data formats and provides faster parsing than regular expressions or full LALR parsers. Several Ruby projects like Mongrel and Hpricot use Ragel for tasks like HTTP request parsing and HTML parsing. When using Ragel with Ruby, it can be compiled to Ruby code directly, which is slow, or a C extension can be written for better performance. The C extension extracts the parsed data from Ragel and makes it available to Ruby.
Local variables are declared within functions and only accessible within that function. Their value is not retained between function calls. Global and static variables are accessible from any function in a file. Static variables retain their value between function calls like global variables but are only accessible within the declared function. Variables can also be declared as const to prevent modification or register for potential faster memory access. The scope of variables determines where they are accessible - variables declared within blocks are only accessible within that block.
Una plataforma educativa es una herramienta física, virtual o combinada que permite la interacción entre usuarios con fines pedagógicos y contribuye a la evolución del aprendizaje y la enseñanza. Actualmente, las universidades utilizan plataformas educativas para administrar materiales, exámenes, comunicaciones y más. Existen plataformas comerciales, de código abierto y desarrollo propio.
This SQL query selects all properties from the alf_node_properties table where the actual type is 21 and there is no matching content data in the alf_content_data table for the long value property.
This SQL query selects all properties from the alf_node_properties table where the actual type is 21 and there is no matching content data in the alf_content_data table for the long value property.