Useful tips for everyday
How can I make a table like another table? Use CREATE TABLE LIKE to create an empty table based on the definition of another table,…
Why is my Oracle database not connecting to my computer? The following are the common Oracle Database connection error codes, their causes, and suggested remedies.…
How do I add a column to an existing table in PostgreSQL? PostgreSQL ADD COLUMN: Add One Or More Columns To a Table First, specify…
What returns rows only when there is at least one row from both tables that matches the join condition? Introduction to SQL LEFT JOIN clause…
How do you recover from point in time? To restore a database to a point in time In Object Explorer, connect to the appropriate instance…
Can a JSON table be returned in a SQL query? Return data from a SQL Server table formatted as JSON. If you have a web…
How do I force tempdb to shrink? To remove additional files in tempdb, use the ALTER DATABASE command by using the REMOVE FILE option. Use…
How to add timestamp to database table? $timestamp = time(); mysql_query(“ALTER TABLE notification ADD timestamp CHAR(30) AFTER names); mysql_query(“INSERT INTO notification (`timestamp`) values (‘$timestamp’); How…
Are GUIDs slow? The use of a GUID to locate a record versus an integer is slightly slower. Unless you have a very high throughput…
Do foreign keys need to be in both tables? Since the purpose of the foreign key is to identify a particular row of referenced table,…