Restrictions You can ask the system catalog pg_database – accessible from any database in the same database cluster. The tricky part is that CREATE DATABASE can only be executed as a single statement. The manual: CREATE DATABASE cannot be executed inside a transaction block. So it cannot be run directly inside a function or DO … Read more
I just discovered csvkit, which is a set of Unix command-line tools for CSV files. I installed it on my Mac with pip install csvkit. The command was: You can alternatively provide a DB connection string and it can load the table directly.
This is commonly reported as an error due to using the wrong version of SSMS(Sql Server Management Studio). Use the version designed for your database version. You can use the command select @@version to check which version of sql server you are actually using. This version is reported in a way that is easier to … Read more
Every SQL database uses its own implementation of the language that varies slightly. While basic queries are almost universal, there are notable nuances between MySQL, PostgreSQL, Microsoft SQL Server, Oracle Database, etc. What’s particularly notable about SQLite is that unlike all the others mentioned above, this database software doesn’t come with a daemon that queries … Read more
Try this: Notes, Cautions and Caveats Your initial solution did not show any obvious santisation of the values before passing them into the Database. This is how SQL Injection attacks (or even un-intentional errors being passed through SQL) occur. Don’t do it! Your database does not seem to have a Primary Key. Whilst these are … Read more
This issue is not because of corrupt database. I found the solution from this video – https://www.youtube.com/watch?v=MqOsp54EA3I It is suggested to increase the values of two variables in php.ini file. Change following in php.ini Then restart the server. This solved my issue. Hope solves yours too.
Simple example. Let’s select students with grades using left outer join: Now the same with left semi-join: The latter is much more efficient.
to_date() returns a date at 00:00:00, so you need to “remove” the minutes from the date you are comparing to: You probably want to create an index on trunc(es_date) if that is something you are doing on a regular basis. The literal ’27-APR-12′ can fail very easily if the default date format is changed to anything different. So make sure … Read more
BLOB : BLOB (Binary Large Object) is a large object data type in the database system. BLOB could store a large chunk of data, document types and even media files like audio or video files. BLOB fields allocate space only whenever the content in the field is utilized. BLOB allocates spaces in Giga Bytes. USAGE OF BLOB : You can write a … Read more
It occurred because you tried to create a foreign key from tblDomare.PersNR to tblBana.BanNR but/and the values in tblDomare.PersNR didn’t match with any of the values in tblBana.BanNR. You cannot create a relation which violates referential integrity.