Step 3: Describe a Table Let’s run the“\d”command followed by the table name to see all the columns present in the selected table: \d staff_details; Step 4: Rename the Column Suppose we have to rename the“staff_location”column to“staff_address”. Execute the“RENAME COLUMN”comman...
Column name –We have used a column name with an update statement in PostgreSQL. We have used a column name from which column we have modified the value from the table. We can change multiple columns or single column values using the update command. Value –This is defined as the value i...
In databases, views are virtual tables that are used to represent the result set of single or multiple tables. SQL Shell supports a very convenient meta-command named “\dv” that is used to describe Postgres views. This command retrieves information about Postgres views including the schema nam...
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In this article, we will describe theunnest()keyword and its uses in PostgreSQL with multiple examples. PostgreSQLunnest ()Functionality In PostgreSQL, you can use an array as a data type. There are also multiple functions related to improving the usability of arrays in the language. ...
In PostgreSQL, you can use the nullif function to prevent errors that may occur when comparing two values. Examples Below is an example of nullif function. We have using a discount table to describe an example of the nullif function as follows. ...
First, the prompt will ask you to specify a name for the new role. The following example names the rolesammybut you can name yours whatever you like: Output Enter name of role to add:sammy Next, you’ll be asked if the new role should be a superuser. In PostgreSQL, a superuser rol...
underperforming if a model, total data, or an access pattern changes, so understanding overall database behavior is imperative. In this post, we covered the stages of a query in PostgreSQL, and how to use explain plans to describe query runs such that inefficiencies can be quicky found...
Scale PostgreSQL via Partitioning: A Dev’s Intro to Hypertables Read more Scale PostgreSQL via Partitioning: A Dev’s Intro to Hypertables Boosting Postgres INSERT Performance by 2x With UNNEST Read more Boosting Postgres INSERT Performance by 2x With UNNEST ...
The following steps describe how to install and configure the PostgreSQL JDBC driver. Note: ODBC connectivity to PostgreSQL is supported with the PostgreSQL ODBC Driver. Click the PostgreSQL JDBC Driver button. The PostgreSQL JDBC driver provides JDBC connectivity to PostgreSQL da...