To list active connections and their details in MariaDB we can use the following queries. Using threads_connected Using processlist Using information_schema.processlist
To avoid a NULL value in a table column in MySQL we specify NOT NULL constraint when you create a table. But NOT NULL constraint still allows empty values. To […]
bad SQL grammar [SELECT JOB_INSTANCE_ID, JOB_NAME from BATCH_JOB_INSTANCE where JOB_NAME = ? and JOB_KEY = ?] Spring Boot / Spring Batch error. How to fix?
Reason for this error : Spring Boot / Spring Batch needs default tables where it can track the batch job related information. If the tables are not available in the […]
java.lang.IllegalStateException: Could not load JDBC driver class [com.mysql.jdbc.Driver] – Spring Boot / Spring Batch error. How to fix?
The reason for this error is you have missed MySQL dependency in your maven / gradle file. Add this in your build.gradle. In case of maven,
In this small post we are going to see how to list all tables that contain a specific column name. In MySQL sometimes you want to list down all tables […]
In this post let’s learn how to create a new table in MySql using the output of a select query. You can create a new table from any select query […]
In this article we will quickly look how to handle the NULL value in an SQL table. A field with a NULL value is a field with no value. The […]
In this quick tutorial we will see how to get the primary key column in the table. Here we can use the below table to list the columns ALL_CONSTRAINTS – […]
In this post, we will learn how to modify the size of an column in oracle table. It’s easy to alter the column size using the ALTER TABLE MODIFY statement. Sometimes the […]
In this post, we will see how to insert a data into a table with the result of select statement. Sometimes we want to move the data from one table […]
In this quick post, let’s see how to import data from csv formatted files into MySQL / MariaDB table. MySQL provides LOAD DATA LOCAL INFILE command to import data from […]
MySQL error – ..but as of v2.0 you must provide streamFactory option returning ReadStream – How to fix?
In this post we will take a look at how to resolve the MySQL error – Error: As a result of LOCAL INFILE command server wants to read emp.csv file, […]
In this post we will take a look at resolving the MySQL error – ERROR 1017 (HY000): Can’t find file: ‘./….frm’ (errno: 13). Error no 13 is is probably due […]
In this post you will learn how to temporarily disable foreign key constraints in MySQL Database. There are some scenarios where you have set foreign keys in a table but […]
In this article, we will see how to construct the single delete query to find and remove the duplicate rows from the table in Oracle SQL. Identifing and deleting the […]
Learn how to calculate the size of each database in MySQL. In MySQL the table data size and index length are stored in a table called TABLES in the database […]
Learn how to update random values from a list into a column in MySQL, Oracle SQL or SQL Server. Let’s say I want to update date from four different values […]
Find out how to fix the Bugzilla issue – Bugzilla keeps asking for credentials while accessing administration. Sometimes this error would also occur when you login to your Bugzilla from […]
When you run a SELECT query on an Oracle database instance, it usually returns the results with column names in Uppercase. In some instances you might need to get the […]
Inserting string with special characters is a pain in the butt, it would seem. It’s easy to escape a string with single quote or ampersand in SQL statements. To escape […]