PostgreSQL LIKE Operator: Pattern Matching in Queries The LIKE operator in PostgreSQL is used for pattern matching within a query. It’s commonly employed when you want to find rows where a column's value fits a specified pattern, typically using wildcard characters like % and _. This is par...
Migrating from MySQL to PostgreSQL using pgloader is a viable and powerful approach. As demonstrated in this POC, while pgloader handles much of the heavy lifting, successful migration often requires careful preparation, iterative testing to identify incompatibilities (like data types, object naming co...
Mastering BigQuery's LIKE operator Free database diagramming tools How to delete data from Elastisearch How to UNION queries in Google BigQuery Understanding primary keys in tables Exiting PostgreSQL's psql command line Query-Based table creation in BigQuery Trimming spaces in Excel & Goog...
进入到 PostgreSQL 的安装目录,并进入到 bin 目录,createdb 命令位于PostgreSQL安装目录/bin下,执行创建数据库的命令: $ cd /Library/PostgreSQL/11/bin/ $ createdb -h localhost -p 5432 -U postgres runoobdb password *** CREATE DATABASE dbname; 选择数据库 使用\l 用于查看已经存在的数据库: postgres=# ...
Luckily there is a way to do this using a Postgres extension that embeds the V8 JavaScript engine in Postgres called PL/V8!3 On Ubuntu, installing PL/V8 is as easy as doingsudo apt-get install postgresql-9.6-plv8(substitute 9.6 with whatever Postgres version you have installed) and restarti...
Fatalf("could not insert row: %v", err) } // the `Result` type has special methods like `RowsAffected` which returns the // total number of affected rows reported by the database // In this case, it will tell us the number of rows that were inserted using // the above query ...
Creating a PostgreSQL DatabaseNow that we have installed the PostgreSQL 8.0 database server, we can turn to creating a database. The first task is to create a PostgreSQL database cluster with the initdb command. As we'd like a secure solution, we recommend creating a special user dedicated...
Enter pg_top, a PostgreSQL specific program to monitor real time activity in a database, as well as view basic information for the database host itself. Much like the linux command ‘top’, running it brings the user into a live interactive display of database activity on the host, refres...
Default privileges are available only for PostgreSQL 9.0 and later. Figure 4-8. Granting default privileges When setting privileges for a schema, make sure to also set the usage privilege on the schema to the groups you will be giving access to. Import and Export Like psql, pgAdmin allows ...
To debug an extension that exposes a function, like the unit tests, first start a SQL session: $ psql -U postgres In order to attach our debugger to the session we need the PID for your current process: postgres=# select pg_backend_pid(); pg_backend_pid --- 14985 (1 row) If we...