replace into

One, partition operation 1. To change a table without partitions to a partitioned tableALTER TABLE trb3 PARTITION BY KEY(id) PARTITIONS 2;2. Deleting a partition# 删除所有分区, 同时数据丢失ALTER TABLE es2 REMOVE PARTITIONING;# 删除指定分区, 数据丢失ALTER TABLE tr DROP

I. BACKGROUNDWhen you update the Access_apps table with the Replace statement, the information for the original Mark column, remark column is lost. CREATETABLE`access_apps` (  `base` varchar(11) NOTNULLDEFAULT‘‘,  `business` varchar(64) 

This article summarizes the common operation commands of DB2 and shares them with you. For friends who use DB2, refer to the following.The DB2 database management client is no longer with the control center since the v9.7 version, but instead uses

You may want to bulk insert a series of data when you bulk process a transaction, but when the data is added once, you do not want to add it again, just want to update the original data, for example: I want to import a series of books into the

In write SQL, there are often such things as updating a row of records, and then getting the updated line. itself from the program, no difficulty, the big deal to cache this line, finished direct access. But from the database point of view, how can

DB2 Load UseRecently a good friend because the load problem caused the production failure, so write an article to summarize the use of load and considerations.1.load OverviewData import method has Insert,import and load three kinds, where load does

1. insert a new recordinto the table using the INSERT statement, with the following syntax: INSERT into table name [( field List )] values(Value list). 2. Update the operation and character set using the SET statement, for example

If it does not exist, insert the new data The code is as follows Copy Code $sql = "INSERT into {$ecs->table (' Cat_lang ')} (CAT_ID,LANG_ID,CAT_NAME,KEYWORDS,CAT_DESC)VALUES ({$cat _id},{$k}, ' {$val [' cat_name ']} ', '

Set up 2 test tables and create a unique constraint on the ID column. Mysql> CREATE TABLE test1 (ID int,name varchar (5), type int,primary key (ID)); Query OK, 0 rows affected (0.01 sec) Mysql> CREATE TABLE test2 (ID int,name varchar (5), type

In many projects, we need to make constant calls and updates to the data and add it to the database if new data comes in. One of the most important is that we do not know whether the data passed in the original database is already in the record, so

/usr/local/mysql/bin/mysql-uroot-proot test-e "LOAD DATA INFILE '/usr/1.txt ' replace into TABLE test FIELDS terminated By ' \ t ' (name,address)Info1.txtZhangsan WuhanLishi WuhanInsert the 1.txt file into the MySQL databaseOn the Internet to see

1.load Data:Practical application: Load the XLS file generated by the log into MySQL:Mysql_cmd ="iconv-c-F utf-8-t GBK./data/al_ver_"+ Yesterday_time +". Xls-o./data/gbk_al_ver_"+ Yesterday_time +". xls"Print(Mysql_cmd) Os.system (mysql_cmd)

MySQL Add/modify field informationThe basic methods of adding are:INSERT into student set name= ' Mingzi ', sex= ' male ', age=19;There are several ways to add:INSERT into student (Name,sex,age) VALUES (' new ', 1,20), (' Another newcomer ',

To manipulate the contents of a database table:--insert data into the table:INSERT INTO TABLE_NAME values (now (), ' a ');INSERT into student (Id,name,sex) VALUES (1, ' Zhangsan ', ' nan ');--insert multiple records into the tableINSERT into student

Keep a record of some grammar that may be used but easily forgotten.first, the common grammar1, "+": do not use string concatenation, only as an operator, other values +null or null2, CONCAT (value1, value2);3, ifnull (value, 0);4, Length (str),

MySQL Import data infile usageBasic Syntax: load data [low_priority] [local] infile ' file_name txt ' [replace | ignore]into table Tbl_name[Fields[Terminated by ' t '][optionally] enclosed by '][escaped by ']][Lines terminated by ' n '][Ignore

Online to read some of the summarized information, do not know that there is no use for everyone, useful words will not be wasted I press the button a piece of painstaking./usr/local/mysql/bin/mysql-uroot-proot test-e "LOAD DATA INFILE '/usr/1.txt '

Batch processing is a non-interactive way to run mysql programs. Like the commands you use in mysql, you will still use these commands.　　　　To implement batch processing, you need to redirect a file to the mysql program. First, we need a text file

When using the following two methods, the field must be set to "primary key" or "UNIQUE constraint (UNIQUE )".1: Use replace into (This method uses the replacement method, which is a bit similar to deleting and then inserting)Copy codeThe Code is as

The backtesting system found that the stock quarterly was not a good representation of the total equity per day. So in Sina found the data source, decided to use Beatifulsoup crawl a bit.First read the stock code corresponding page,1 code =