大约有 40,000 项符合查询结果（耗时：0.0207秒） [XML]
PHP/MySQL insert row then get 'id'
...);
See mysqli_insert_id().
Whatever you do, don't insert and then do a "SELECT MAX(id) FROM mytable". Like you say, it's a race condition and there's no need. mysqli_insert_id() already has this functionality.
share
...
Windows重置网络命令 - 环境配置 - 清泛IT论坛，有思想、有深度
启动cmd.exe命令提示窗口，输入以下命令：
命令：netsh winsock reset
回车，重启电脑，即可重置网络连接配置。
在一般的网络连接问题中，这个方法是最简单也是最能彻底解决问题的……
How do I calculate tables size in Oracle
...BLE_NAME FORMAT A32
COLUMN OBJECT_NAME FORMAT A32
COLUMN OWNER FORMAT A10
SELECT
owner,
table_name,
TRUNC(sum(bytes)/1024/1024) Meg,
ROUND( ratio_to_report( sum(bytes) ) over () * 100) Percent
FROM
(SELECT segment_name table_name, owner, bytes
FROM dba_segments
WHERE segment_type IN...
how to log in to mysql and query the database from linux terminal
I am using debian linux.
I have a linux machine on which mysql is install.
I can log in to my linux machine using root user as well as other user.
I can connect to mysql database on linux machine from windows machine using sqlyog.
Now I want to execute queries on linux machine only using linux termi...
sql query to return differences between two tables
...colum C, here are the records, which are present in table A but not in B:
SELECT A.*
FROM A
LEFT JOIN B ON (A.C = B.C)
WHERE B.C IS NULL
To get all the differences with a single query, a full join must be used, like this:
SELECT A.*, B.*
FROM A
FULL JOIN B ON (A.C = B.C)
WHERE A.C IS NUL...
Splitting string into multiple rows in Oracle
... be an improved way (also with regexp and connect by):
with temp as
(
select 108 Name, 'test' Project, 'Err1, Err2, Err3' Error from dual
union all
select 109, 'test2', 'Err1' from dual
)
select distinct
t.name, t.project,
trim(regexp_substr(t.error, '[^,]+', 1, levels.column_value...
How to get cumulative sum
the above select returns me the following.
16 Answers
16
...
How to export and import a .sql file from command line with options? [duplicate]
...mysql_location -u $u_name -p $db_name < $sql_file
else
echo "please select a valid command"
fi
share
|
improve this answer
|
Reshaping data.frame from wide to long format
...
Here is another example showing the use of gather from tidyr. You can select the columns to gather either by removing them individually (as I do here), or by including the years you want explicitly.
Note that, to handle the commas (and X's added if check.names = FALSE is not set), I am also us...
Access mysql remote database from command line
...
To directly login to a remote mysql console, use the below command:
mysql -u {username} -p'{password}' \
-h {remote server ip or name} -P {port} \
-D {DB name}
For example
mysql -u root -p'root' \
-h 127.0.0.1 -P 3306 \
-D loca...