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Posts tagged sql
Sometimes, either to reduce the amount of typing big table names or when joining a table to itself one will need to alias a table. Personally I find SQL statements with aliases harder to read and a...
I have some SQL scripts that contain DDL to create tables and schemas for a database. I'd like to be able to comment this SQL and then use those comments to generate output documentation (in HTML)...
I have two tables with millions of records. Every so often I need to join them and exclude just a handful of records where a bit(1) column is set to 1 instead of 0. I can do it with either, WHERE ...
I have noticed some time ago that Entity Framework assumes a CASCADE behaviour (implicit value, if not specified) for referential constraints (FKs) when deleting items. This means that by default, ...
In programming instead of arrowcode where one has many layers of indented if statements, you can return a result as soon as possible. So instead of, if if end if end if It looks like if ret...
I have a number of MySQL stored procedures that use a cursor to go through a select and then pass the results to other stored procedures one row at a time. This can take a while to run, what is hap...
From time to time I will have large structural changes to make on my MySQL DB, things like adding columns, changing datatypes, adding indexes etc. These types of changes result in downtime and what...
I have a bunch of stored procedures that look like something this CREATE PROCEDURE example() BEGIN UPDATE STATEMENT A; UPDATE STATEMENT B; UPDATE STATEMENT C; END// When I run them thr...
If one finds where the past number of months equals the past number of days like this, select distinct DATE_SUB(now(), INTERVAL 92 DAY),DATE_SUB(now(), INTERVAL 3 MONTH) The numbers that are curre...
I need to add one column with the same name to all of the tables in my database, how can I find which tables don't currently have a column with that name?
Sometimes I will need to temporarily lock out other MySQL users when I am making large structure changes and want to make sure that nobody else is inputting or changing the data. The other use case...
I need to rename one column in 170 tables in a MySQL database and its going really slow. The columns all have an index plus a foreign key on them, would dropping the index/temporarily removing the...
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