postgres boolean select

Assume that the following two tables exist. T_media: Mediaid flags 11111 1 22222 1 33333 1 44444 1 T_media_locations: Mediaid locationid 11111 999999 22222 999999 33333 999999 Now there is a need to count the number of media in the flags = 1

How to debug Plpgsql with PGADMINIII[[email protected] soft_bak]# git clone git://git.postgresql.org/git/pldebugger.gitInitialized Empty Git repository in/opt/soft_bak/pldebugger/.git/Remote:counting objects:445, done.Remote:compressing objects:100%

The code is as follows:Copy code Instance description3.1 view the number of bytes required to store a specified valueDavid = # select pg_column_size (1 );Pg_column_size----------------              4(1 row)David = # select pg_column_size (10000 );

SelectNameSelect-extract several rows from a table or view. Select [All | distinct [ON (expression [,...])]Expression [as name] [,...][Into [temporary | temp] [Table] new_table][From table [alias] [,...][Where condition][Group by column

I. Test creation table:[email protected] ~]$ cat Test.sqlCREATE TABLE weather (city varchar), Temp_lo int,Temp_hi int, PRCP real,date date);Two. Import the Test.sql file generation table:Testdb01=> \i Test.sql(Single Step mode:verify command) *******

First, Introduction PostgreSQL provides a number of system management functions to view tables, indexes, table spaces, and the size of the database, described in detail below. second, the Database object dimension function The name

I have a lazy idea. How should this good idea begin? Well, this is an appropriate little madness: Why not build our own MongoDB version directly on the basis of postgres? It sounds far-fetched, but it's simple and real. When the NoSQL movement was

Recently contacted pgrouting. Record the learning results. Using pgrouting for path planning can only import line data, and mutiline will fail. Note This when importing data.1. Create a database There are two methods:1. Create a pgadmin

Original linkAbsrtact: Not accumulate Kuibu not even thousands of miles, want to become a qualified database administrator, first of all should have solid basic knowledge and problem processing ability. This article refers to the pivotal official

Tutorial on creating a MongoDB copy based on PostgreSQL, postgresqlmongodb I have an idea of laziness. How can I start with this idea? Well, this is an appropriate little crazy: Why don't we build our own MongoDB version on the basis of ipvs? It