Learn Features Of SQL Which Makes SQL Language More Accessible-converted

Jul 29, 2021

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In this article, you will learn features of SQL that make SQL easily accessible for programmers to manage database systems. Learn more about SQL by SQL experts.

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Learn Features Of SQL Which Makes SQL Language More Accessible-converted

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More SQL functions

More SQL functions. As usual,there is additional information in the speaker notes!. Decode function. This command decodes the field jobcode and then performs a task. The results go in proposed_new_salary.

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More on SQL. Lecture Week 9 INFS 614, Fall 2008. R1. Example Instances. S1. S2. SQL: Seen so far…. Syntax of Basic SQL query: Relation-list ( FROM ) Target-list ( SELECT ) Qualification ( WHERE ) Semantic : Conceptual Evaluation Strategy; String operators: LIKE , NOT LIKE ;

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More about SQL

More about SQL. More about SELECT, Nested selects GROUP BY, HAVING, ORDER BY Other joins Aggregate functions Views. SQL2 - DML. (Q16): Sub queries (nested SELECTs) SELECT E.FNAME, E.LNAME FROM EMPLOYEE E WHERE E.SSN IN (SELECT ESSN FROM DEPENDENT WHERE ESSN = E.SSN

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More SQL Select

More SQL Select. Database Systems Lecture 8 Natasha Alechina. In This Lecture. More SQL Select Aliases ‘Self-joins’ Subqueries IN, EXISTS, ANY, ALL For more information Connoly and Begg Chapter 5 Ullman and Widom Chapter 6.3. CD cID Title Price Mix 9.99

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More sql

More sql. Session 4 – subselects, union, aggregate functions. Sub-selects. The search criteria in the where clause may itself contain a select statement. Such a select statement is referred a a sub-select. sub-select operators. in and not in

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SQL : Query Language

SQL : Query Language. Part II. Sorting: ORDER BY clause. SELECT * FROM Student WHERE sNumber >= 1 ORDER BY sNumber, sName.  (sNumber, sName) ( (sNumber >= 1) (Student)). Subqueries. Subquery returns a relation Nest subqueries into WHERE clause Nest subqueries into FROM clause.

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More about SQL

More about SQL. Nested SELECT Other Joins Views Index. SQL2 - DML. (Q16): Sub queries (nested SELECTs) SELECT E.FNAME, E.LNAME FROM EMPLOYEE E WHERE E.SSN IN (SELECT ESSN FROM DEPENDENT WHERE ESSN = E.SSN AND E.FNAME = DEPENDENT_NAME AND SEX = E.SEX)

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More SQL

More SQL. Database Modification Defining a Database Schema Views. Database Modifications. A modification command does not return a result (as a query does), but changes the database in some way. Three kinds of modifications: Insert a tuple or tuples. Delete a tuple or tuples.

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More SQL Features

More SQL Features. Alter Table Grant Revoke Outer Join. Alter Table. Add a column called major to the Student Table. The data type for major is varchar(20) alter table Student add column major varchar(20) Remove a column called password from the Student Table

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SQL Language

SQL Language. SQL Language. Introduction to RDBMS Basic Data Manipulation - Reading Data Basic Data Manipulation - Changing Data Data Manipulation - Joins Creating Data Tables and Referential Integrity Optional: Defining and Using Views Summarized Queries. Introduction to RDBMS.

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More on SQL

Indra Budi indra@cs.ui.ac.id. More on SQL. True/False. SQL stands for Standard Query Language . SQL is only a data manipulation language (DML). The SQL keyword CREATE is used to name a new table and describe the table's columns.

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More SQL

More SQL. Extended Relational Algebra Outerjoins, Grouping/Aggregation Insert/Delete/Update. The Extended Algebra. δ = eliminate duplicates from bags. τ = sort tuples. γ = grouping and aggregation. Outerjoin : avoids “ dangling tuples ” = tuples that do not join with anything.

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SQL LANGUAGE TUTORIAL

SQL LANGUAGE TUTORIAL. Prof: Dr. Shu-Ching Chen TA: Hsin-Yu Ha. Basic Syntax of SQL Language. SELECT attribute name(s) FROM table name WHERE comparison predicate (Boolean expression) GROUP BY attribute name HAVING comparison predicate ORDER BY attribute name. Create Tables.

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More SQL

More SQL. Relations as Bags Grouping and Aggregation Database Modification. Union, Intersection, and Difference. Union, intersection, and difference of relations are expressed by the following forms, each involving subqueries: ( subquery ) UNION ( subquery )

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More SQL Select

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More SQL

More SQL. Outerjoins , Grouping/Aggregation Insert/Delete/Update. Outerjoin. Suppose we join R ⋈ C S . A tuple of R that has no tuple of S with which it joins is said to be dangling . Similarly for a tuple of S . Outerjoin preserves dangling tuples by padding them NULL.

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More on SQL

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More sql

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SQL LANGUAGE TUTORIAL

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SQL LANGUAGE TUTORIAL

SQL LANGUAGE TUTORIAL. Prof: Dr. Shu-Ching Chen TA: Haiman Tian. Basic Syntax of SQL Language. SELECT attribute name(s) FROM table name WHERE comparison predicate (Boolean expression) GROUP BY attribute name (s) HAVING comparison predicate ORDER BY attribute name (s). Create Tables.

519 views • 50 slides

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