If we have not used a like operator with an underscore and percentage sign, it will work as an equal operator in PostgreSQL. Like query is used when we cannot remember the string’s exact name. If the student table contains the column as a student name and we want to find the student ...
PostgreSQL IN operator is used in a WHERE clause. We can reduce multiple OR conditions written in where clause with the help of the IN Operator. The PostgreSQL IN operator checks whether a given value is exist or not in the list of values provided. We can use the PostgreSQL IN operator i...
While working with PostgreSQL, we may encounter a situation where we need to convert one data type into another. For instance, converting a numeric string into an int, a string to date, etc. For this purpose, PostgreSQL provides a CAST operator that assists us in converting one data type ...
it can get a bit difficult to query nested JSON structures. It is important to use appropriate JSON operators and functions to navigate and query nested JSON objects and arrays. Functions like->,->>,#>, and#>>can help access nested elements. The->operator returns a JSON object, and->>r...
Learn how to use Vacuum for Better PostgreSQL Performance in our Free Webinar When done correctly, vacuuming can greatly speed up performance and optimize dead space. However, vacuuming can also degrade performance when done incorrectly. Our expert-led webinar, “Using Vacuum to Clean Up PostgreSQL...
Range predicates use theBETWEENoperator to test whether one value expression falls between two othersMembership: This type of predicate uses theINoperator to test whether a value is a member of a given setPattern Match: Pattern matching predicates use theLIKEoperator to test whether a value matches...
Another notable keyword to use in PostgreSQL is theINTEGERkeyword. INTEGERis listed under the headings of DATE/TIME FUNCTIONS AND OPERATORS in the PostgreSQL documentation. Here is a table to define things in more detail: To use the+keyword, go ahead and do something like this: ...
Example 4: Querying Array’s Data Using Built-in Operators You can also use built-in operators like ANY, SOME, etc. to compare the array elements with some specific value. For instance, in the following snippet, we utilize the ANY operator to check if an employee has an email “john123...
Pivoting in PostgreSQL The PostgreSQL database also does not support the SQLPIVOToperator. Therefore, when creating pivot tables, it is important to use theCASEstatement with conditional aggregation.The query below is an example of the conditionalCASEstatements used to create pivot tables in PostgreSQL...
Don't get me wrong: JSON support in PostgreSQL is a wonderful thing. It is just that many people don't understand how to use it right. For example, the majority ofquestions about PostgreSQL and JSON asked on Stackoverfloware about problems that arise from the use of JSON where it had ...