大约有 42,000 项符合查询结果（耗时：0.0321秒） [XML]
How do I calculate tables size in Oracle
... WHERE segment_type IN ('TABLE', 'TABLE PARTITION', 'TABLE SUBPARTITION')
UNION ALL
SELECT i.table_name, i.owner, s.bytes
FROM dba_indexes i, dba_segments s
WHERE s.segment_name = i.index_name
AND s.owner = i.owner
AND s.segment_type IN ('INDEX', 'INDEX PARTITION', 'INDEX SUBPARTITION')
U...
A better similarity ranking algorithm for variable length strings
...tr2.length-2).collect {|i| str2[i,2]}.reject {
|pair| pair.include? " "}
union = pairs1.size + pairs2.size
intersection = 0
pairs1.each do |p1|
0.upto(pairs2.size-1) do |i|
if p1 == pairs2[i]
intersection += 1
pairs2.slice!(i)
break
end
end
end
(2.0 * inter...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...rchar, it's free to use 1-3 bytes per character as needed. This is in the MySQL manual: dev.mysql.com/doc/refman/5.0/en/charset-unicode-utf8.html
– Gavin Towey
Mar 27 '14 at 2:14
...
Hidden Features of MySQL
...QL Server with many years now but have only just recently started to use MySQL with my web applications, and I'm hungry for knowledge.
...
LISTAGG in Oracle to return distinct values
...ta as
(
select 'A' as col1, 'T_a1' as col2, '123' as col3 from dual
union select 'A', 'T_a1', '456' from dual
union select 'A', 'T_a1', '789' from dual
union select 'A', 'T_a2', '123' from dual
union select 'A', 'T_a2', '456' from dual
union select 'A', 'T_a2', '111' from dual
union select 'A...
sql query to return differences between two tables
...
( SELECT * FROM table1
EXCEPT
SELECT * FROM table2)
UNION ALL
( SELECT * FROM table2
EXCEPT
SELECT * FROM table1)
share
|
improve this answer
|
...
How to list the tables in a SQLite database file that was opened with ATTACH?
...Not necesserily. Consider you are doing a DB wrapper able to use SQLite or MySql (my case). Using more SQL-conform commands would make it easier to port the wrapped in other languages then if you'd use DB-vendor specific commands.
– Valentin Heinitz
Apr 8 '13 a...
Is there a combination of “LIKE” and “IN” in SQL?
...t; create table mytable (something)
2 as
3 select 'blabla' from dual union all
4 select 'notbla' from dual union all
5 select 'ofooof' from dual union all
6 select 'ofofof' from dual union all
7 select 'batzzz' from dual
8 /
Table created.
The original syntax:
SQL> select...
linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tables -Z -t nat
2,添加规则
添加基本的NAT地址转换,(关于如何配置NAT可以看我的另一篇文章),
添加规则,我们只添加DROP链.因为默认链全是ACCEPT.
防止外网用内网IP欺骗
[root@tp sysconfig]# iptables -t nat -A PREROUTING -i eth0 -s 10.0.0.0/8 -j DRO...
How can I prevent SQL injection in PHP?
...name ]);
foreach ($stmt as $row) {
// Do something with $row
}
Using MySQLi (for MySQL):
$stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?');
$stmt->bind_param('s', $name); // 's' specifies the variable type => 'string'
$stmt->execute();
$result = $stmt->...