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How to check if a table exists in a given schema
...tion in a function. Example:
Check if sequence exists in Postgres (plpgsql)
A query like above avoids possible exceptions and is therefore slightly faster.
to_regclass(rel_name) in Postgres 9.4+
Much simpler now:
SELECT to_regclass('schema_name.table_name');
Same as the cast, but it retur...
SSL is not enabled on the server
...uld establish DB connection without SSL encryption, like that:
db, err := sql.Open("postgres", "user=test password=test dbname=test sslmode=disable")
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Primary key/foreign Key naming convention [closed]
... same name in both tables (convention #2), you can use the USING syntax in SQL to save some typing and some boilerplate noise:
SELECT name, address, amount
FROM employees JOIN payroll USING (employee_id)
Another argument in favor of convention #2 is that it's the way the relational model was de...
华为公司的新产品研发流程管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...化的条件反射。这样的产品一般会有太多的甚至是不利的性能，因而不能处于有利的竞争地位。产品的定义也是随机的，不能成为一个有机战略的一部分。其结果是，各个产品相互拼凑，不能形成一条一体化的产品线。
产...
How to install mongoDB on windows?
...efault. Lets go query that.
But how without any management studios? Unlike SQL, we have to depend on the command prompt. Yes exactly the same command prompt… our good old command prompt… Heiiiii.. Don’t get afraid yes it’s our old command prompt only.
Ok let’s go and see how we are going ...
How to enable Ad Hoc Distributed Queries
When I run a query with OPENROWSET in SQL Server 2000 it works.
4 Answers
4
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Javascript fuzzy search that makes sense
...rt them in preference order.
I wrote some notes on Fuzzy String Search in SQL. See:
http://literatejava.com/sql/fuzzy-string-search-sql/
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What is the difference between declarative and procedural programming paradigms?
...nguages which support the declarative programming paradigm:
yacc
Treetop
SQL
Regular Expressions
lex
XSLT
markup, troff, CSS, VHDL
Functional
Functional programming emphasizes the application of functions without side effects and without mutable state. The declarative systems above exhibit cert...
What's the use of session.flush() in Hibernate
...aid in above answers, by calling flush() we force hibernate to execute the SQL commands on Database. But do understand that changes are not "committed" yet.
So after doing flush and before doing commit, if you access DB directly (say from SQL prompt) and check the modified rows, you will NOT see th...
现实版《道士下山》：道长老梁的四面人生 - 轻松一刻 - 清泛网 - 专注C/C++...
...个真实自在的自己，开心快乐，坦然面对生活。”
即便包括父亲在内的家人，并不理解他选择出家，甚至还有异样的眼光，但“他知道我不是在做坏事害人，他就满意了”。
其实，老梁还有个目标远大的“理想”，希望有一...