How to resolve ORA-011033: ORACLE initialization or shutdown in progress
After some googling, I found the advice to do the following, and it worked:
database
1052: Column ‘id’ in field list is ambiguous
SQL supports qualifying a column by prefixing the reference with either the full table name: …or a table alias: The table alias is the recommended approach — why type more than you have to? Why Do These Queries Look Different? Secondly, my answers use ANSI-92 JOIN syntax (yours is ANSI-89). While they perform the same, … Read more
how to drop partition without dropping data in MySQL?
I have a table like: Not exactly like above but similar to that…. Now assume that my table has 200000 rows and now I want to remove partitions on the table and reorganize them in accordance to requirement without MAX VALUE in it. Can any one help me to rearrange partition without dropping data or … Read more
Why do I get SQLCODE=-204, SQLSTATE=42704 with DB2 LUW and WebSphere App Server?
The answer is case sensitivity. This answer was in fact provided by mustaccio in a comment, but they don’t seem to want to add it as an answer. If you see this, @mustaccio, please add your own answer, so I can accept it. Anyway, it turns out that WAS appears to effectively put quotes round the values you … Read more
How to get size of mysql database?
Run this query and you’ll probably get what you’re looking for: This query comes from the mysql forums, where there are more comprehensive instructions available.
Error Code: 2013. Lost connection to MySQL server during query
New versions of MySQL WorkBench have an option to change specific timeouts. For me it was under Edit → Preferences → SQL Editor → DBMS connection read time out (in seconds): 600 Changed the value to 6000. Also unchecked limit rows as putting a limit in every time I want to search the whole data … Read more
Create a new database with MySQL Workbench
Launch MySQL Workbench. On the left pane of the welcome window, choose a database to connect to under “Open Connection to Start Querying”. The query window will open. On its left pane, there is a section titled “Object Browser”, which shows the list of databases. (Side note: The terms “schema” and “database” are synonymous in … Read more
What is the difference between JOIN and UNION?
UNION puts lines from queries after each other, while JOIN makes a cartesian product and subsets it — completely different operations. Trivial example of UNION: similary trivial example of JOIN:
MySQL SELECT increment counter
This part: makes it possible to introduce a variable without the need of a seperate query. So the first query could also be broken down into two queries like this: for instance when used in a stored procedure.