大约有 40,000 项符合查询结果（耗时：0.0477秒） [XML]
Convert SQLITE SQL dump file to POSTGRESQL
...made constraint such as this:
CREATE TABLE tablename (
...
unsigned_column_name integer CHECK (unsigned_column_name > 0)
);
While SQLite defaults null values to '', PostgreSQL requires them to be set as NULL.
The syntax in the SQLite dump file appears to be mostly compatible with Postgre...
PyPy — How can it possibly beat CPython?
...ification and implementation
aspects. We call this the RPython toolchain_.
a compliant, flexible and fast implementation of the Python_
Language which uses the above toolchain to enable new advanced
high-level features without having to encode the low-level
details.
By sep...
mysql check collation of a table
...luding the collation.
For example SHOW TABLE STATUS where name like 'TABLE_NAME'
share
|
improve this answer
|
follow
|
...
How to define an enumerated type (enum) in C?
...one like this:
enum strategy {RANDOM, IMMEDIATE, SEARCH};
enum strategy my_strategy = IMMEDIATE;
However, you can use a typedef to shorten the variable declarations, like so:
typedef enum {RANDOM, IMMEDIATE, SEARCH} strategy;
strategy my_strategy = IMMEDIATE;
Having a naming convention to dist...
pandas: multiple conditions while indexing data frame - unexpected behavior
...
You can use query(), i.e.:
df_filtered = df.query('a == 4 & b != 2')
share
|
improve this answer
|
follow
|
...
Where can I set environment variables that crontab will use?
...ng every hour. The user running it has environment variabless in the .bash_profile that work when the user runs the job from the terminal, however, obviously these don't get picked up by crontab when it runs.
...
Using capistrano to deploy from different git branches
...S, orelse the argument would not pass through to cap, when using fetch(:var_name, 'default') to get it.
– Frederik Struck-Schøning
Jan 23 '14 at 10:14
1
...
Xcode suddenly stopped running project on hardware: “Could not launch xxx.app: .. No such file..” [c
... How in the world it got changed is beyond me.
– karl_
Dec 6 '12 at 18:04
1
Yeah it solved my pro...
Is it possible to make anonymous inner classes in Java static?
... implementation dependent: this code prints true using javac (sun-jdk-1.7.0_10) and false using Eclipse compiler.
– Paul Bellora
Apr 18 '13 at 14:19
1
...
Difference between this and self in self-type annotations?
...
btw you can also do _: B => for the non-alias case for simplicity
– Creos
Jun 19 '19 at 17:29
add a comment
...