truncate | 易学教程

ORA delete / truncate

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问题 I'm using SQL loader to load my data into database. Before I insert the data I need to remove existing data in the table: options(skip=1,load=250000,errors=0,ROWS=30000,BINDSIZE=10485760) load data infile 'G:1.csv' "str '^_^'" replace into table IMPORT_ABC fields terminated by "," OPTIONALLY ENCLOSED BY '"' trailing nullcols( . . . .) But I got error like: SQL*LOADER-926: OCI error while executing delete/truncate for table IMPORT_ABC ORA-30036: unable to extend segment by 8 in undo tablespace

ORA delete / truncate

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SQL中drop,delete和truncate分析

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不同点： 1. truncate 和 delete 只删除数据不删除表的结构(定义) drop 语句将删除表的结构被依赖的约束(constrain)、触发器(trigger)、索引(index);依赖于该表的存储过程/函数将保留,但是变为 invalid 状态。 2. delete 语句是数据库操作语言(dml),这个操作会放到 rollback segement 中,事务提交之后才生效;如果有相应的 trigger,执行的时候将被触发。 truncate、drop 是数据库定义语言(ddl),操作立即生效,原数据不放到 rollback segment 中,不能回滚,操作不触发 trigger。 3.delete 语句不影响表所占用的 extent,高水线(high watermark)保持原位置不动显然drop 语句将表所占用的空间全部释放。 truncate 语句缺省情况下见空间释放到 minextents个 extent,除非使用reuse storage;truncate 会将高水线复位(回到最开始)。 4.速度,一般来说: drop> truncate > delete 5.安全性：小心使用 drop 和 truncate,尤其没有备份的时候.否则哭都来不及使用上,想删除部分数据行用 delete,注意带上where子句. 回滚段要足够大. 想删除表,当然用

Text-overflow: ellipsis alignment issue

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问题 I have the product name and pricing as separate spans insides a link to work properly with Rich Snippets. Some products have larger length names than others so I'm truncating the length so it fits the box I have. Previously this was done on the server but I'd prefer to have it handled with CSS so any changes to the design doesn't involve the backend pages changing. The problem is I cannot make the spans line up next to each other. With tinkering the display attribute, the text-overflow

Lua: Rounding numbers and then truncate

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问题 Which is the best efficient way to round up a number and then truncate it (remove decimal places after rounding up)? for example if decimal is above 0.5 (that is, 0.6, 0.7, and so on), I want to round up and then truncate (case 1). Otherwise, I would like to truncate (case 2) for example: 232.98266601563 => after rounding and truncate = 233 (case 1) 232.49445450000 => after rounding and truncate = 232 (case 2) 232.50000000000 => after rounding and truncate = 232 (case 2) 回答1: There is no

Access Query Memo field truncation due to “distinct”

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问题 I am having problems running a query without either truncating the note field in NotesTbl or returning repeated entries. UID is not unique for AccessTbl. When I leave out "distinct" notes will return multiple times because I am joining with AccessTbl on a non-distinct condition. When I use distict, the note field is trunctated because it is a memo field. Here is my query: SELECT DISTINCT NotesTbl.pin, NotesTbl.noteid, NotesTbl.note, NotesTbl.date, AccessTbl.affiliation, AccessTbl.name FROM

Pandas Dataframe How to cut off float decimal points without rounding?

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问题 I have longitude and latitude in two dataframes that are close together. If I run an exact similarity check such as test_similar = test1_latlon.loc[~test1_latlon['cr'].isin(test2_latlon['cr'])] I get a lot of failures because a lot of the numbers are off at the 5th decimal place. I want to truncate at after the 3rd decimal. I've seen people format so it shows up truncated, but I want to change the actual value. Using round() rounds off the data and I get even more errors, so is there a way to

Primary Key Resetting Issue with foreign keys and delete

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问题 I have a set of tables which I am going to clear out and upload new data into. One of these, Person has foreign keys pointing to it which prevent me from using TRUNCATE Table even though the other tables are empty. I have used DELETE FROM after turning off the foreign key checks to get around this. This works except when I insert new values they start at the old value going up and I need them to reset to start at 1 again (or at least some consistent predictable value) DBCC CHECKIDENT ([Person

MySQL TRUNCATE or ROUND with variable decimal length

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问题 I am not able to TRUNCATE (or round) a decimal on variable decimal lengh . Here's my MySQL query: SELECT TRUNCATE( `amount` , `decimal_length` ) AS truncated_decimal, FROM table -- sample data amount decimal length 123.123 0 456.456 1 789.789 2 --expected outcome truncated_decimal 123 456.4 789.78 --current outcome (wrong) truncated_decimal 123.123 456.456 789.789 My truncated_decimal variable is returned WITHOUT truncation, i.e. default decimal length from table. Same behavior with ROUND

Get all Foreign Keys for All dependent tables for One Table to nth Level

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问题 I have one table Called Member with Column Name Member_Id . This Table Referred by more than 23 other tables as Primary Table with Member_Id as Foreign Column. Now these 23 tables also have Primary Keys, and some serve also as Primary table for other tables. So I want to fetch all Foreign Keys for all dependent Table referring to table Member . My Goal is to Truncate Member table which has Foreign keys. I can't use Delete as these tables have more data, so it may take ages for me to delete