records from multiple tables with unions. Subqueries Subqueries are queries embedded in queries. They are used to retrieve data from one table based on data in another table. They generally are used when tables have some kind of relationship. For example‚ in the NorthWind database‚ the Orders table has a CustomerID field‚ which references a customer in the Customers table. Retrieving the CustomerID for a specific order is pretty straightforward. Code Sample 1 /* Find the CustomerID of the company
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Tugas mandiri Andre nanda pratama jaelani‚ 112400161‚ MBTIe CREATE TABLE DEPARTMENT (dept_id VARCHAR (5) NOT NULL‚ Nama_Dept VARCHAR (20) NOT NULL‚ PRIMARY KEY (DEPT_id)); CREATE TABLE PEGAWAI (ID_peg INT (5) NOT NULL‚ Nama_peg VARCHAR (20) NOT NULL‚ Alamat VARCHAR (20) NOT NULL‚ ID_Dept VARCHAR (5) NOT NULL‚ PRIMARY KEY (ID_peg)‚ FOREIGN KEY (ID_Dept) references pegawai (ID_peg)); INSERT INTO Department VALUES (’B001’‚’HRC’)‚ (’B002’‚’IT’)‚ (’B003’‚’FINANCE’)‚ (’B004’‚’LOGISTIC’); INSERT INTO
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conditions listed in the WHERE clause. SELECT "column_name" FROM "table_name" WHERE "simple condition" {[AND|OR] "simple condition"}+ Order By The SQL ORDER BY clause comes in handy when you want to sort your SQL result sets by some column(s). For example if you want to select all the persons from the already familiar Customers table and order the result by date of birth‚ you will use the following statement: SELECT "column_name" FROM "table_name" [WHERE "condition"] ORDER BY "column_name" [ASC
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Database management Homework 1 Chapter 1. Getting started A. Create a simple list of owners and properties. B. Describe modification problems. There are three problems. First is deletion problem‚ second is update problem‚ third is insertion problem. Deletion problem is when you want to delete data‚ you may lost too much data. Update problem is when you want to update data‚ the sheet may have inconsistent data. Last insertion problem is when you want to insert some data‚ you must
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reference: http://www.tutorialspoint.com/sql important: constrains: SQL constraints are used to specify rules for the data in a table. If there is any violation between the constraint and the data action‚ the action is aborted by the constraint. In SQL‚ we have the following constraints: NOT NULL - Indicates that a column cannot store NULL value UNIQUE - Ensures that each rows for a column must have a unique value PRIMARY KEY - A combination of a NOT NULL and UNIQUE. Ensures that
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the Laws of Supply and Demand The simulation in the text is about a small city by the name of Atlantis. Atlantis is a well-maintained city with many positive aspects for the community. All of the aspects make it a pleasant living environment. For example‚ the city has maintained streets‚ maintained sidewalks‚ large parks and jogging paths. To rent an apartment in the community of Atlantis an individual would have to go through Good life Management. The current vacancy rate is at 28 percent of availability
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Summarising articles for thesis: Example 1 Karim‚ Zaidi & Wahid (2004) studied the performance of zakat distribution in Perak‚ Kedah‚ Negeri Sembilan and Selangor. The objective of the study is to compare the trend in zakat distribution in the selected states. They used the financial report of 1990 to 2001 from the respective State Islamic Religious Councils to analyze the trend in zakat distribution. They found that‚ on average the respective SIRCS only distributed 69% to 80% of the amount of
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which is no less serious than narcomania or alcoholism. For instance‚ in August 2005‚ a report surfaced about the death of a 28-year-old southern Korean gamer who had spent 50 hours playing a real-time strategy game (BBC). For another significant example‚ one needs to look no further than July 2012‚ when a Taiwanese teenager fatally collapsed after a 40-hour game session (Crawley). Cases like these are actually quite numerous and happen all around the world. They make additional arguments to the negative
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Social Mobilization Theory - an interdisciplinary study within the social sciences that generally seeks to explain why social mobilization occurs‚ the forms underwhich it manifests‚ as well as potential social‚ cultural‚ and political consequences. The three current‚ leading theories explaining these phenomena include: Resource Mobilization- The assumption here is that for a social movement to first exist and then to thrive‚ it needs to operate similar to a business which makes efficient
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Alibaba.com Assessed Supplier Main Product Lines Verification Report Presented to Shenzhen Created Computer Co.‚ Ltd. 深圳创想电脑有限公司 Room 401‚ 4/F‚ South Block‚ High-tech Industrial Park‚ No. 2‚ Beier Company Address Road‚ Bantian Street‚ Longgang District‚ Shenzhen City‚ Guangdong Province‚ China Consigner of Assessment: Alibaba Gold Supplier Member ID: cxwldz Gold Supplier Company Name: Shenzhen Created Computer Co.‚ Ltd. Contact Person: Ms. Yan Jiang Phone Number:
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