postgresql substr

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Data Processing-PostgreSQL process Language Learning Some time ago, when the company switched to the new PostgreSQL data mart system, it downloaded the postgresqlAPI PDF file to study the PostgreSQL data mart. I found that using PostgreSQL process

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.

Date Operation1.operation current date and timeOracle Select sysdate from dual; PostgreSQL Select current_date;Select now (); Return date Time also includes time zone2. The acquisition subdomain of the operating timeOracle: Select to_char

Some time ago, when the company replaced the new PostgreSQL Data mart system, it downloaded the Postgresqlapi PDF file and researched the PostgreSQL data mart. Discover the use of PostgreSQL process language can greatly speed up the efficiency of

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

Five tips for Instagram to improve PostgreSQL performance, postgresql Performance Optimization As Instagram grows, Postgres continues to serve as a solid foundation for Instagram and stores a vast majority of user data. Less than a year ago, we also

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

PostgreSQL type ConversionLike Oracle, PostgreSQL also has a powerful type conversion function, with just two types of conversion examples below.--1 Examplepostgres=# Select 1/4;? column?----------0(1 row)In PG If you want to divide and want to keep

Today, the interception function is needed to deal with the redundancy of database field content that was generated by a bug.I looked through the Internet and found this string function position.POSITION (substr in str)POSITION (substr in str) are a