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Add a default value to a column through a migration
...an a change block. You can leave the down block empty. It won't revert the table to the original condition but the migration can be rolled back.
– IAmNaN
May 16 '14 at 1:16
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How to remove not null constraint in sql server using query
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ALTER TABLE YourTable ALTER COLUMN YourColumn columnType NULL
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How to add not null constraint to existing column in MySQL
I have table name called "Person" with following column names
2 Answers
2
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记一次数据库表自增长（Auto Increment）故障 - 数据库(内核) - 清泛网 - ...
...主键值。
我们不妨创建一个测试表说明问题：
CREATE TABLE IF NOT EXISTS `test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
然后插入一行问题数据：
INSERT INTO test (id, name) VALUES (2147483647...
SQLAlchemy: print the actual query
...'literal_binds' flag, passed to compile_kwargs:
from sqlalchemy.sql import table, column, select
t = table('t', column('x'))
s = select([t]).where(t.c.x == 5)
print(s.compile(compile_kwargs={"literal_binds": True}))
the above approach has the caveats that it is only supported for basic
types, su...
Best way to synchronize local HTML5 DB (WebSQL Storage, SQLite) with a server (2 way sync) [closed]
...ize the lib (at each startup for example).
It will automatically create 2 tables (if they don't already exists, one to store all the new or modified elements (table new_elem) and one to store the date of the last sync (table sync_info). It will also create SQLite triggers in order to watch the INSE...
MySQL INNER JOIN select only one row from second table
I have a users table and a payments table, for each user, those of which have payments, may have multiple associated payments in the payments table. I would like to select all users who have payments, but only select their latest payment. I'm trying this SQL but i've never tried nested SQL sta...
SQL Server Index Naming Conventions [closed]
...dexes
All of my index name take the form of
<index or key type>_<table name>_<column 1>_<column 2>_<column n>
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Change cursor to hand when mouse goes over a row in table
...he cursor pointer to hand when my mouse goes over a <tr> in a <table>
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Python: List vs Dict for look up table
I have about 10million values that I need to put in some type of look up table, so I was wondering which would be more efficient a list or dict ?
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