postgresql substring function

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.

: Network Disk DownloadContent Profile ...This book will help you understand and use the PostgreSQL open source database system. Not only will you learn about enterprise features in versions 9.2, 9.3, and 9.4, but you'll also find that PostgreSQL is

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.

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

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

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

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

SQL Server data migration to PostgreSQL error explanation and solution, serverpostgresql Problem reproduction: 1. PG client: postgres=# create table text_test (id int,info text);CREATE TABLEpostgres=# insert into text_test values (1,E'\0x00');ERROR:

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