20120810 tsql tips
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The document discusses SQL functions like COUNT, REPLICATE, POWER, and RIGHT. It also covers stored procedures like sp_who2 and dynamic management views like sys.dm_exec_requests that can be used to monitor current SQL queries. A number of Microsoft documentation URLs are provided for additional reference.
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The document discusses process control in Node.js using state machines, promises, and generators. It covers using EventEmitter to create a state machine that emits events. It explains how promises are used to handle asynchronous operations and avoid callback hell. Generators are used to pause and resume functions through the yield keyword.
Expression tree
Expression trees represent code in a tree-like data structure where each node is an expression. This enables dynamic modification of executable code, execution of LINQ queries in various databases, and creation of dynamic queries. Expression trees can be compiled into executable code using the Expression<TDelegate>.Compile() method.
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CSS Flex Box Layout is a CSS3 web layout model that allows elements within a container to be automatically arranged and resized depending on screen size. It defines flex containers and flex items, with properties that control alignment, order, sizing, and distribution of space. Common flex properties include flex-direction, flex-wrap, justify-content, align-items, and properties for individual flex items like order, flex-grow, and align-self. Flexbox provides more flexible layout options compared to traditional CSS box model properties.
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The child_process module provides several methods for spawning child processes from Node.js applications including exec, execFile, spawn, and fork. exec spawns a shell and runs a command, passing stdout and stderr to a callback. execFile is similar but spawns directly without a shell. spawn spawns a process and returns a ChildProcess object for sending/receiving messages. fork spawns a new Node.js process and allows sending messages between parent and child.
20160415ken.lee
This document discusses ShowModalDialog for Chrome, which is a library that aims to provide modal dialog functionality for Chrome similar to IE's ShowModalDialog method. It covers Chrome and IE compatibility issues with modal dialogs and provides examples of using ShowModalDialog for Chrome, including customizing select options and accessing event handlers via jQuery. It also demonstrates using eval() to evaluate JavaScript expressions and executing code on document ready.
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The document discusses Elasticsearch concepts and operations including:
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Expression trees represent code in a tree-like data structure where each node is an expression. This enables dynamic modification of executable code, execution of LINQ queries in various databases, and creation of dynamic queries. Expression trees can be compiled into executable code using the Expression<TDelegate>.Compile() method.
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D3.js is a JavaScript library for manipulating documents based on data. It allows binding data to the DOM and applying data-driven transformations. The document discusses using D3.js to create force-directed graphs by binding data to SVG elements like paths, circles, and text. Key aspects covered include the D3 force layout to simulate physical forces on nodes, and SVG attributes to define paths, circles, text position and styling.
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https://alandix.com/academic/papers/synergy2024-epistemic/
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In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
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Presented by Vladimir Iglovikov:
- https://www.linkedin.com/in/iglovikov/
- https://x.com/viglovikov
- https://www.instagram.com/ternaus/
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20120810 tsql tips
- 1. by Anney 09/04/12 1
- 2. • COUNT(*) •8 • COUNT(Name) •6 • COUNT(DISTINCT Name) •4 09/04/12 2
- 3. • COUNT(*) • returns the number of items in a group. This includes NULL values and duplicates. • COUNT(ALL expression) • evaluates expression for each row in a group and returns the number of nonnull values. • COUNT(DISTINCT expression) • evaluates expression for each row in a group and returns the number of unique, nonnull values. • Tips • If return values greater than 2^31-1, COUNT produces an error. • COUNT_BIG() 09/04/12 3
- 4. • REPLICATE • REPLICATE('0', 4 - LEN(3)) + CONVERT(varchar(4), 3) • POWER • RIGHT(CONVERT(varchar(10), POWER(10, 4) + 3), 4) • 10000 + 3 => ‘10003’ • Tips: • POWER ( float_expression , y ) • 數值轉型兩次 (int -> float, float -> varchar) • RIGHT • RIGHT('0000' + CONVERT(varchar(4), 3), 4) • ‘0000’ + ‘3’ => ‘00003’ 09/04/12 4
- 5. • sp_who2 procedure • 所有連線狀況 , 也可以看到連線是否有被卡住 (Blocked) 的狀況。 09/04/12 5
- 6. • sys.dm_exec_requests • sys.dm_exec_sql_text(sql_handle | plan_handle) 09/04/12 6
- 7. • http:// msdn.microsoft.com/en-us/library/ms175997(SQL.105). aspx • http://msdn.microsoft.com/en-us/library/ms174276.aspx • http://blog.miniasp.com/post/2010/05/19/T-SQL-Tips-Fixed-Le • http://blog.miniasp.com/post/2010/10/13/How-to-get- current-executing-statements-in-SQL-Server.aspx • http://msdn.microsoft.com/en-us/library/ms177648.aspx • http://msdn.microsoft.com/en-us/library/ms181929.aspx 09/04/12 7
- 8. 09/04/12 8