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INSERT - SYNTAX INSERT INTO tableName VALUES ( firstColumnValue. Delete ALL rows from the table class101! Beware that there is NO UNDO! +-+-+-+ DELETE - SYNTAX DELETE FROM tableName WHERE criteria - EXAMPLES If two rows have the same gpa, order by name in ascending order. Order the result by gpa in descending order. SELECT * FROM class101 WHERE gpa > 4 AND name LIKE 'k%' ORDER BY gpa DESC, name ASC - Use AND, OR, NOT to combine simple conditions. wildcard _ matches one (any) character. wildcard % matches zero or more (any) characters SELECT name FROM class101 WHERE name LIKE 'k%' - Use "LIKE" to perform pattern-matching on strings, with SELECT name, gpa FROM class101 WHERE name = 'Tan Ah Teck' - Perform FULL-match on strings (= or !=). You can compare numbers (INT, FLOAT) using =, >, =, (!=) SELECT name, gpa FROM class101 WHERE gpa >= 4.7 - Select columns name and gpa from table class101, where the rows meet the criterion (gpa >= 4.7). The wildcard * denotes all the columns. SELECT * FROM class101 - Select ALL columns from table class101. FROM tableName WHERE criteria SELECT * FROM tableName WHERE criteria - EXAMPLES SELECT name, gpa FROM class101 - Select columns name and gpa from table class101. SQL (Structure Query Language) defines a set of intuitive commands (such as SELECT, INSERT, DELETE, UPDATE) to interact with relational database system. | id (INT) | name (VARCHAR(50)) | gpa (FLOAT) | We choose: INT (integer) for column id, VARCHAR(50) (variable-length string of up to 50 characters) for name, and FLOAT (floating-point number) for gpa. Suppose we have a database called studentdb, a table called class101 in the database with 3 columns ( id, name, gpa) and 4 rows as illustrated below. A table have rows (or records) and columns (or fields).A relational database system contains many databases.SQL By ExamplesĪ relational database system organizes data in the following hierarchy: However, most of the database vendors have their own directs, e.g., PL/SQL (Oracle), Transact-SQL (Microsoft, SAP), PL/pgSQL (PostgreSQL). SQL, one of the earlier programming language, was subsequently developed by Donald D. Codd of IBM proposed the Relational Database Model in 1970. SQL defines a set of commands, such as SELECT, INSERT, UPDATE, DELETE, CREATE TABLE, DROP TABLE, and etc.Įdgar F. the open-source MySQL, PostgreSQL, mariaDB, Embedded Apache Derby (Java DB), mSQL (mini-SQL), SQLite, Apache OpenOffice's Base, and mongoDB (non-relational).Ī high-level programming language, called Structure Query Language (SQL), is designed for interacting with the relational databases.the commercial Oracle, IBM DB2, Microsoft SQL Server and Access, SAP Hana.Popular Relationship Database Management System (RDBMS) includes: Tables are related based on common columns to eliminate data redundancy and ensure data integrity. A table has rows (or records) and columns (or fields). This article is applicable to MySQL 8.0, which is the successor of MySQL 5.7, where 5 was dropped?! Introduction to Relational Database and SQL Relational DatabasesĪ relational database organizes data in tables. And you can capture multiple sources at once, which can be very useful if you’re creating tutorials or internal documentation.īeyond these basic features, OBS Studio gives you many options for customizing the look and feel of your recordings. You can capture just your browser window, a portion of your screen, or specific apps. What makes it so powerful? To start, it offers you immense control over which parts of your screen you capture. While it has many features aimed at people who want to stream games over Twitch or other services, it’s also a powerful standalone screen recorder. OBS Studio is our top pick for general screen recording. Overview: Free, open-source screen recording software for streaming and video capture across platforms. Whether you need to capture videos for work, a class project, or your gaming YouTube channel, there’s an app for you on this list. To make your life easier, we’ve put together this list of the best screen recording software on the market. However, the sheer number of options can be overwhelming. From basic, free tools to advanced, paid options, there are dozens of choices available for capturing the contents of your computer screen. Luckily, it’s easier than ever to create high-quality screen recordings. You could write hundreds or thousands of words explaining how to do a task, but why do that when you could explain the same thing in a 30-second screen recording? Sometimes, it’s easier to show than tell. They are factual and caring about others, and will be supportive, but they may take longer to open up about themselves. ISFJs are sociable but are low key are prefer 1:1 conversations or small groups. Then they would prefer to focus and methodically work through their list, with input from others every now and again. ISFJs want to feel included and valued by the team, and they need a clear, factual understanding of what it is they are expected to achieve. Although not the most vocal member of the team, the ISFJ will make sure the team moves towards a 'known' conclusion in a planned way. The ISFJ will bring order, clarity, organisation and planning. Taking logical actions to step things forward. They have a strong sense of right and wrong and this tends to be around what has been agreed, so they will become irritated if someone doesn’t keep their promises.Ĭreating order, seeing a plan come together and delivering it to exceptional standards. They are fine with more formal, process-led conflict. ISTJs prefer to keep themselves to themselves and so they will struggle with overt conflict, ie with someone who wants to engage verbally. They will get frustrated with too much ‘blue sky’ talk as they would rather deal in the facts and the realities of the ‘here and now.’ ISTJs can be quite detached and formal in their communication as they are task-oriented and prefer a purpose for speaking, rather than chit chat. They have high standards and can be quite formal and will expect everyone to do what they have agreed. They work methodically and steadily, completing one thing and moving on to the next. They want to agree what needs to be done, get their heads down, focus and get on with it. ISTJs are practical, factual, action oriented people. They have a strong eye for detail and can therefore protect the team from going off in a wrong direction or from over-enthusiasm. ISTJs bring a strong sense of planning, agreeing objectives and working steadily towards closure. |
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