MySQL – Find Duplicate Records Table of content Duplicate records in a table decrease the efficiency of a MySQL database (by increasing the execution time, using unnecessary space, etc.). Thus, locating duplicates becomes necessary to efficiently use the database. We can, however, also prevent users from entering duplicate values into a table, by adding constraints […]
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MySQL – Standard Deviation Table of content MySQL Standard Deviation Functions are mathematical functions that are used to calculate the variation or dispertion between values in a dataset. There are two types of standard deviations in MySQL, they are population standard deviation and sample standard deviation. Popular standard deviation The “population standard deviation” is the […]
MySQL – JSON Table of content MySQL provides a native JSON (JavaScript Object Notation) datatype that enables efficient access to the data in JSON documents. This datatype is introduced in MySQL versions 5.7.8 and later. Before it was introduced, the JSON-format strings were stored in the string columns of a table. However, the JSON datatype […]