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Compelling examples of custom C++ allocators?
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I'm working with a MySQL storage engine that uses c++ for its code. We're using a custom allocator to use the MySQL memory system rather than competing with MySQL for memory. It allows us to make sure we're using memory as the user configured M...
What does “export” do in shell programming? [duplicate]
... are copied - but for any kind of subprocess, not only for subshells. So a mysql process get value from MYSQL_PWD env var, but would have no concept of MYSQL_PWD shell var.
– David Tonhofer
Dec 24 '18 at 15:43
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How do I list all the columns in a table?
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For MySQL, use:
DESCRIBE name_of_table;
This also works for Oracle as long as you are using SQL*Plus, or Oracle's SQL Developer.
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'IF' in 'SELECT' statement - choose output value based on column values
...IF(type = 'P', amount, amount * -1) as amount
FROM report
See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html.
Additionally, you could handle when the condition is null. In the case of a null amount:
SELECT id,
IF(type = 'P', IFNULL(amount,0), IFNULL(amount,0) * -1) as...
SQL Client for Mac OS X that works with MS SQL Server [closed]
...r, which can work very well with almost every type of databases, including MySQL, SQL Server, Oracle, PostgreSQL, SAP Hana, Redis... just to name a few. The DB connector driver can be added in a very easy to understand way. I've also tried Oracle SQL Developer, DB Visualizer but they do not work w...
“’” showing on page instead of “ ' ”
... when you create it.
You're most likely using SQL Server, but here is some MySQL code (copied from this article):
CREATE DATABASE db_name CHARACTER SET utf8;
CREATE TABLE tbl_name (...) CHARACTER SET utf8;
If your table is however already UTF-8, then you need to take a step back. Who or what put th...
SQL order string as number
I have numbers saved as VARCHAR to a MySQL database. I can not make them INT due to some other depending circumstances.
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Add Foreign Key to existing table
...is link. It has helped me with errno 150:
http://verysimple.com/2006/10/22/mysql-error-number-1005-cant-create-table-mydbsql-328_45frm-errno-150/
On the top of my head two things come to mind.
Is your foreign key index a unique name in the whole database (#3 in the list)?
Are you trying to set th...
Choosing a stand-alone full-text search server: Sphinx or SOLR? [closed]
... Lucene committers.
Sphinx integrates more tightly with RDBMSs, especially MySQL.
Solr can be integrated with Hadoop to build distributed applications
Solr can be integrated with Nutch to quickly build a fully-fledged web search engine with crawler.
Solr can index proprietary formats like Microsoft ...
How to create a table from select query result in SQL Server 2008 [duplicate]
...a new table, but instead appends the data into an existing table, e.g. dev.mysql.com/doc/refman/8.0/en/….
– flow2k
May 19 at 8:07
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