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svn cleanup: sqlite: database disk image is malformed
... following blog post helped me resolve it:
http://www.polak.ro/svn-e200030-sqlite-database-disk-image-is-malformed.html
You do an integrity check on the sqlite database that keeps track of the repository (/.svn/wc.db):
sqlite3 .svn/wc.db "pragma integrity_check"
That should report some errors.
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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...完整唤醒锁()
获取完整的唤醒锁，保持设备完全唤醒，包括 CPU 和屏幕。
返回类型：无返回值
AquirePartialWakeLock 获取部分唤醒锁()
获取部分唤醒锁，仅保持 CPU 运行，允许屏幕关闭。
返回类型：无返回...
How to select rows that have current day's timestamp?
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See the difference: SQL-Fiddle Notice the FILTERED = 25 in the 2nd query.
– ypercubeᵀᴹ
Feb 8 '13 at 12:28
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Checking oracle sid and database name
...ght be worth noting that not all of the methods give you the same output:
SQL> select sys_context('userenv','db_name') from dual;
SYS_CONTEXT('USERENV','DB_NAME')
--------------------------------------------------------------------------------
orcl
SQL> select ora_database_name from dual;
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Unknown Column In Where Clause
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SQL is evaluated backwards, from right to left. So the where clause is parsed and evaluate prior to the select clause. Because of this the aliasing of u_name to user_name has not yet occurred.
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mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to
I am trying to select data from a MySQL table, but I get one of the following error messages:
31 Answers
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Converting an array of objects to ActiveRecord::Relation
...rray to an ActiveRecord::Relation since a Relation is just a builder for a SQL query and its methods do not operate on actual data.
However, if what you want is a relation then:
for ActiveRecord 3.x, don’t call all and instead call scoped, which will give back a Relation which represents the sa...
How to truncate a foreign key constrained table?
...in PHPMYADMIN, this works only if you use all the transactions in the same SQL window (separated by a ;). This is because each fresh web SQL call will reset the FOREIGN_KEY_CHECKS to 1.
– Sablefoste
Oct 7 '13 at 21:17
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Oracle “(+)” Operator
I am checking some old SQL Statements for the purpose of documenting them and probably enhancing them.
4 Answers
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NOT IN vs NOT EXISTS
...duce the row count to zero makes cardinality estimation very difficult. If SQL Server assumes that this will happen but in fact there were no NULL rows in the data the rest of the execution plan may be catastrophically worse, if this is just part of a larger query, with inappropriate nested loops ca...