The BETWEEN operator is inclusive. From Books Online: BETWEEN returns TRUE if the value of test_expression is greater than or equal to the value of begin_expression and less than or equal to the value of end_expression. DateTime Caveat NB: With DateTimes you have to be careful; if only a date is given the value is … Read more
not mysqldump, but mysql cli… mysql -e “select * from myTable” -u myuser -pxxxxxxxxx mydatabase you can redirect it out to a file if you want : mysql -e “select * from myTable” -u myuser -pxxxxxxxx mydatabase > mydumpfile.txt Update: Original post asked if he could dump from the database by query. What he asked … Read more
SELECT t1.ks, t1.[# Tasks], COALESCE(t2.[# Late], 0) AS [# Late] FROM (SELECT ks, COUNT(*) AS ‘# Tasks’ FROM Table GROUP BY ks) t1 LEFT JOIN (SELECT ks, COUNT(*) AS ‘# Late’ FROM Table WHERE Age > Palt GROUP BY ks) t2 ON (t1.ks = t2.ks);
And if you just want to create the constraint on its own, you can use ALTER TABLE alter table MyTable add constraint MyTable_MyColumn_FK FOREIGN KEY ( MyColumn ) references MyOtherTable(PKColumn) I wouldn’t recommend the syntax mentioned by Sara Chipps for inline creation, just because I would rather name my own constraints.
There are 3 main ways to perform a case-insensitive search in Oracle without using full-text indexes. Ultimately what method you choose is dependent on your individual circumstances; the main thing to remember is that to improve performance you must index correctly for case-insensitive searching. 1. Case your column and your string identically. You can force … Read more
Install the additional module tablefunc once per database, which provides the function crosstab(). Since Postgres 9.1 you can use CREATE EXTENSION for that: CREATE EXTENSION IF NOT EXISTS tablefunc; Improved test case CREATE TABLE tbl ( section text , status text , ct integer — “count” is a reserved word in standard SQL ); INSERT … Read more
You should be able to just run select * from information_schema.tables to get a listing of every table being managed by Postgres for a particular database. You can also add a where table_schema=”information_schema” to see just the tables in the information schema.
One example, if you need to reference/join the same data set multiple times you can do so by defining a CTE. Therefore, it can be a form of code re-use. An example of self referencing is recursion: Recursive Queries Using CTE For exciting Microsoft definitions Taken from Books Online: A CTE can be used to: … Read more
Just write Select id,name,age From Student Where age < 15 Union Select id,name,age From Student Where Name like “%a%” Order by name the order by is applied to the complete resultset
I’m going to add a somewhat longer and more detailed explanation of the steps to take to solve this problem. I apologize if it’s too long. I’ll start out with the base you’ve given and use it to define a couple of terms that I’ll use for the rest of this post. This will be … Read more