SQL*Loader FAQ
转自：http://www.orafaq.com/wiki/SQL*Loader_FAQ#How_can_one_get_SQL.2ALoader_to_COMMIT_only_at_the_end_of_the_load_file.3F
Contents
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1
What is SQL*Loader and what is it used for?
2
How does one use the SQL*Loader utility?
3
How does one load MS-Excel data into Oracle?
4
Is there a SQL*Unloader to download data to a flat file?
5
Can one load variable and fixed length data records?
6
Can one skip header records while loading?
7
Can one modify data as the database gets loaded?
8
Can one load data from multiple files/ into multiple tables at once?
9
Can one selectively load only the records that one needs?
10
Can one skip certain columns while loading data?
11
How does one load multi-line records?
12
How does one load records with multi-line fields?
13
How can one get SQL*Loader to COMMIT only at the end of the load file?
14
Can one improve the performance of SQL*Loader?
15
What is the difference between the conventional and direct path loader?
16
How does one use SQL*Loader to load images, sound clips and documents?
17
How does one load EBCDIC data?
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What is SQL*Loader and what is it used for?
SQL*Loader is a bulk loader utility used for moving data from external files into the Oracle database
. Its syntax is similar to that of the DB2
load utility, but comes with more options. SQL*Loader supports various load formats, selective loading, and multi-table loads.
SQL*Loader (sqlldr) is the utility to use for high
performance data loads. The data can be loaded from any text file and
inserted into the database.
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How does one use the SQL*Loader utility?
One can load data into an Oracle database by using the sqlldr (sqlload on some platforms) utility. Invoke the utility without arguments to get a list of available parameters. Look at the following example:
sqlldr username@server/password control=loader.ctl
sqlldr username/password@server control=loader.ctl
This sample control file (
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Sql代码
--采用SQL语句实现sql2005和Excel 数据之间的数据导入导出，在网上找来一--下，实现方法是这样的：
--Excel---->SQL2005 导入：
select * into useinfo from O ......
1.打开SQL server enterprise mananger “企业管理器”
在你要导出的SQL数据库上鼠标右键菜单：所有任务-》导出数据
2.回出现一个导出向导窗口。
选择被导出的数据源，为你刚才所选择的数据库，如果发现不对应自行修改。
3.进入导出到目标数据源的选择，这里我们要转成ACCESS的数据库。注意选择数据源类型� ......
http://www.umgr.com/blog/PostView.aspx?bpId=36294
1. 执行sql语句
int sqlite3_exec(sqlite3*， const char *sql， sqlite3_callbacksql 语法
， void *， char **errmsg );
这就是执行一条 sql 语句的函数。
第1个参数不再说了，是前面open函数得到的指针。说了是关键数据结构。
第2个参数const char ......
分页语句
sqlserver 方案1: select top 10 * from t where id not in(select top 30 id from t order by id) order by id
方案2： select top 10 * from t where id in (select top 40 id from t order by id)oder by id desc
mysql: select * from t order by id limit 30,10
oracle: select * from (select rownu ......
想起来上次面试的时候那个面试官问我
“你对优化方面了解多少”
“ORACLE优化还是SQL优化”
“SQL优化”
“这个……不知道从何说起”
“呵呵，那我问你问题好了，问问就知道你大概什么水平了”
“呵呵，好吧”
……
结果好像 ......
