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Altering a column: null to not null
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2040
First, make all current NULL values disappear:
UPDATE [Table] SET [Column]=0 WHERE [Column] ...
How can I detect if a selector returns null?
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edited Jun 23 '11 at 5:43
answered May 28 '09 at 11:10
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Converting BigDecimal to Integer
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212
You would call myBigDecimal.intValueExact() (or just intValue()) and it will even throw an exc...
Get DateTime.Now with milliseconds precision
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edited Feb 23 at 3:49
Callum Watkins
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How to add a downloaded .box file to Vagrant?
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answered Feb 28 '14 at 9:57
Petrus TheronPetrus Theron
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In Unix, can I run 'make' in a directory without cd'ing to that directory first?
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342
make -C /path/to/dir
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Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
Boost.Asio的简单使用(Timer,Thread,Io_service类)2. 同步Timer本章介绍asio如何在定时器上进行阻塞等待(blocking wait).实现,我们包含必要的头文件.所有的asio类可以简单的通过include "...目录：
1. 同步Timer
2. 异步Timer
3. 回调函数的参数
4. 成...
How do I replace text inside a div element?
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answered Sep 23 '08 at 15:46
John TopleyJohn Topley
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How to reset AUTO_INCREMENT in MySQL?
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24 Answers
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Adding 'serial' to existing column in Postgres
...ER COLUMN a SET NOT NULL;
ALTER SEQUENCE foo_a_seq OWNED BY foo.a; -- 8.2 or later
SELECT MAX(a) FROM foo;
SELECT setval('foo_a_seq', 5); -- replace 5 by SELECT MAX result
INSERT INTO foo (b) VALUES('teste');
INSERT INTO bar (b) VALUES('teste');
SELECT * FROM foo;
SELECT * FROM bar;
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