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PostgreSQL tutorial (5): Functions and operators (1), postgresql Operators

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 database construction, login, Ddl,dml,help, logout, delete library operation

PostgreSQL Create a databaseTo create a Xifenfei library using the shell-level createdb command-bash-3.2$ Createdb XifenfeiSystem Authentication Login PostgreSQL DatabaseUsing the Xifenfei database in the psql login PostgreSQL-bash-3.2$ Psql

Detailed explanation of the use of Full-text search in PostgreSQL _ database other

When developing Web applications, you often have to add search capabilities. I didn't even know what to search, so I drew a magnifying glass on the sketch. Search is a very important feature, so lucene based tools like Elasticsearch and SOLR become

4.2. PostgreSQL-Value expressions

4.2. Value expressionsValue expressions are used in a variety of syntax environments, such as in the target list of the SELECT command, as new column values in INSERT or UPDATE , or in search conditions for many commands. We sometimes call the

PostgreSQL 9.1.3 plpgsql debugger module

Today, a netizen asked PostgreSQL 9.0 how to debug functions in the group. I remember there was a plug-in named edb-debugger in 8.3 that could be used. there is no 9.0 database at hand, so I tested it and it could not be used at 9.1. The result is

PostgreSQL Tutorial (V): A detailed explanation of functions and operators (1) _postgresql

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

Read with me. PostgreSQL Source (10)--executor (--scan node of the query execution module (bottom))

Then read with me. PostgreSQL source Code (ix)--executor (the--scan node (top) of the query execution module), this chapter ends the remaining seven scan nodes. T_SubqueryScanState, T_FunctionScanState, T_ValuesScanState, T_CteScanState,

"Database" PostgreSQL and SQL Primary use (tpc-h data application)

Tools:PostgreSQLOperating environment:Ubantu 14.0Data source:tpc-h DbgenTASK1:1. Download PostgreSQL (sudo install PostgreSQL), the results are as follows.TASK2:1. Follow the tutorial and go to the Dbgen folder to modify the makefile file. Then

Measuring PostgreSQL Checkpoint Statistics

Checkpoints can is a major drag on Write-heavy PostgreSQL installations. The first step toward identifying issues in this "to" monitor how often they happen, which just got a easier to use Interface added to the database recently.Checkpoints is

PostgreSQL function usage

  Test environment: win2003 + postgresql8.3 (postgresql89.0 is not easy to use)   1. Create a database language 1. Open the Start Menu/Program/PostgreSQL 8.3/command prompt 2. Run the "createlang-u Postgres plpgsql S" command" For example,

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