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Complex Joins. Outline for Today: • The URISA Proceedings database - more practice with increasingly complicated SQL queries. • Advanced Queries: o Sub-queries: one way to nest or a cascade query is Example: Find the parcel with the highest estimated loss from a fire. SELECT *. FROM FIRES. WHERE ESTLOSS =.
5.1 More Complex SQL Retrieval Queries. Because of the meanings is intended; for example, a NULL for the home phone of a person can have any Nested Queries, Tuples, and Set/Multiset Comparison: SQL Join Operators: Inner Join: The relational join operation merges rows from two tables and returns the rows with
Advanced SQL. Lecture 3. 2. Outline. • Unions, intersections, differences. • Subqueries, Aggregations, NULLs. • Modifying databases, Indexes, Views. Reading: . FROM. Purchase x. WHERE x.date > “9/1". 26. Another Example. SELECT product, Sum(price * quantity) AS SumSales. Max(quantity) AS MaxQuantity. FROM.
17 Sep 2014 Adv. SQL - Window Functions, CTEs, LATERAL. JSONB and SP-GIST. Functions - Overview. Function Basics. Functions - By Example. Query Syntax. Simple Queries. Joins. Set Operations. Subqueries. Queries. Syntax Overview- VALUES, TABLE. Last, but not least, the most complicated ones of all.
Eliminating Duplicates. ? Sometimes need to eliminate duplicates in SQL queries. ? Can use DISTINCT keyword to eliminate duplicates. ? Example: “Find the number of branches that currently have loans." SELECT COUNT(branch_name) FROM loan;. ? Doesn't work, because branches may have multiple loans.
27 Jul 2005 q Example: If “Perryridge" is a branch name appearing in one of the tuples in the account relation, then there exists a tuple in the branch relation for branch “Perryridge". s Primary and candidate keys and foreign keys can be specified as part of the SQL create table statement: q The primary key clause lists
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CS 377 [Spring 2016] - Ho. Correlated Nested Queries. • Correlated: inner query (query in the WHERE clause) uses one or more attributes from relation(s) specified in the outer query. • Uncorrelated: inner query is a stand-alone query that can be executed independently from the outer query. • Example Syntax: SELECT
Advanced SQL. Solutions to Practice Exercises. 4.1 Query: create table loan. (loan number char(10), branch name char(15), amount integer, primary key (loan number), foreign key (branch name) references branch) create table borrower. (customer name char(20), loan number char(10), primary key (customer name, loan
Objectives. In this lesson, you learn about more advanced features of the SELECT statement. You can write subqueries in the WHERE clause of another SQL statement to obtain values based on an unknown . The example in the slide displays the employee last name, job ID, and salary of all employees whose salary is
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