# Divide / 12select cast(30 as float) / 120, 30::float / 120, 30 / 120;--0.25 0.25 0 # VARIADIC Parameter 参数 nums 是一个数组，可以传入任意多个参数；然后计算它们的和值。 例如： SELECT sum_num(1,2), sum_num(1,2,3); sum_num sum_num 3 6 1234567891011CREATE OR REPLACE FUNCTION sum_num(VARIADIC nums numeric[])RETURNS numericAS...

转载：Shipping Dates vs. Delivery Dates: What’s the Difference? 45% of customers abandon their carts due to unsatisfactory delivery options. Without crucial details like shipping dates and delivery dates built into your online experience, you could be losing sales. The ecommerce landscape is...

转载：Bill of Lading: Meaning, Types, Example, and Purpose # What Is a Bill of Lading? A bill of lading (BL or BoL) is a legal document issued by a carrier (transportation company) to a shipper that details the type, quantity, and destination of the goods being carried. A bill of lading also serves as...

转载：generate_series: an Oracle implementation in light of SQL Design Patterns - The Spatial Database Advisor # GENERATE_SERIES There is a very useful function in PostgreSQL called generate_series that can be used to generate a series of integer numbers from some start value to an end value with an...

The DBMS_RANDOM package provides a built-in random number generator. # Using DBMS_RANDOM The RANDOM function produces integers in the range [-2^^31, 2^^31). The VALUE function produces numbers in the range [0,1) with 38 digits of precision. DBMS_RANDOM can be explicitly initialized but does not...

转载：ORACLE-BASE - ROLLUP, CUBE, GROUPING Functions and GROUPING SETS This article gives an overview of the functionality available for aggregation in data warehouses, focusing specifically on the information required for the Oracle Database SQL Expert (1Z0-047) exam. Setup GROUP...

转载：Various declarations of main() function in C - Codeforwin main() is a special function in C programming language. Reasons that make it special are – It defines starting point of the program. main is the first executed function. It controls all other child functions. Behaves as both user-defined...

转载：How to Create Your Own Google Chrome Extension If you are a Google Chrome user, you’ve probably used some extensions in the browser. Have you ever wondered how to build one yourself? In this article, I will show you how you can create a Chrome extension from scratch. # What is a Chrome...

# How to use a CTE instead of complicated CASE expressions In the past I’ve had to write queries to convert data in a table into user-friendly display text. One way to do this is with CASE expressions. For example, let’s say you have a table with a column being a country code, and you want to add...