substring postgresql example

Recently prepared for PostgreSQL database development related knowledge, this article summarizes the PPT content through the blog record sharing, this essay's main content is to introduce the PostgreSQL database basic information, and how to use the

PostgreSQL tutorial (5): Functions and operators (1), postgresql Operators I. logical operators: Common logical operators include AND, OR, and not. Its semantics is exactly the same as that of logical operators in other programming languages. Ii.

PostgreSQL tutorial (6): Functions and operators (2), postgresql Operators 6. Pattern Matching: PostgreSQL provides three methods for implementing pattern matching: SQL LIKE operator, closer SIMILAR TO operator, and POSIX-style regular expression.1.

One, the logical operator: The common logical operators are: and, or and not. The semantics are exactly the same as the logical operators in other programming languages. Second, the comparison operator: The following is a list of comparison

String Functions:The string functions in PostgreSQL are: Calculate string length functions, string merge functions, string substitution functions, string comparison functions, find specified string position functions, and so on.1. Functions to count

Vi. Pattern Matching: PostgreSQL provides three ways to implement pattern matching: SQL Like operator, more recent similar to operator, and posix-style regular expression.1. Like: Copy Code code as follows: string like pattern

Function return type Describe Example Results string | | String Text String connection ' Post ' | | ' Gresql ' PostgreSQL Bit_length (String) Int The number of bits in a

All messages sent by the PostgreSQL server are given a five-character error code that follows the custom of the SQL "SQLSTATE" code. Apps that need to know what error conditions are occurring should usually test the error code instead of the text

Reference http://www.php100.com/manual/PostgreSQL8/functions-matching.html likestring pattern [escape-character ]stringpattern [escape-character ] Each pattern defines a collection of strings. If the string is contained in a string collection

Description ORA2PG: Oracle PostgreSQL Database Mode Converter is a free tool for Oracle Database migration to PostgreSQL compatibility mode. It connects to the Oracle database, scans it to automatically extract its structure or data, and generates