MySQL

MySQL Query results row field stitching, can be implemented with the following two functions:1. Concat functionMysql> Select Concat (' 1 ', ' 2 ', ' 3 ') from test; +---------------------+| Concat (' 1 ', ' 2 ', ' 3 ') |+---------------------+| 123 |

If you do not set the installation path yourself, MySQL is installed on C:/Program files/mysql/mysql Server 5.1 By default, and the new database file is in C:/Documents and Settings/all users/ Application Data/mysql/mysql Server 5.1/data

One afternoon in learning MySQL, the most valuable is this a little bitOrder by can arrange the position of the fields that appear in the select sentence Eg:select name,count (*) from the EG group by name order by 2;; The meaning of 2 here is the

Start the "Blind Toss series", this series is purely blind toss, may have no practical significance.MySQL Stored Procedure generation table:Create a new user table that contains the ID, username, password, usertable fields.Then create the stored

There was a time when a log was set to query SQL statements in MySQL that are slower than 1 seconds. Just suddenly recalled the method of setting, there are several parameters of the name of the dead and alive, so re-organize, make a note.The

CREATE PROCEDURE Feemonth (inchFmark varchar ( $),inchFuserChar( +),inchFtime BIGINT,inchFmonthChar(6) BEGIN #定义SQL变量 declare create_sql varchar ( -); DECLARE sel_sql varchar ( -); DECLARE del_sql varchar ( -); DECLARE Fmon varchar ( -); #定义表名变量

Various methods of MySQL password changeWe have compiled the following four ways to change the root password in MySQL, which may help!Method 1: Use the Set password commandMysql-urootMysql>set PASSWORD for ' root ' @ ' localhost ' = PASSWORD ('

There are several system directories found in the data directory under the MySQL installation directory, which sets the DataDir value in the My.ini file to this directory.The main configuration after the change

mysql backup and restore are done using the mysqldump, MySQL, and source commands. Backup and restore of MySQL under 1.win32 1.1 Backup Start Menu | run | cmd | Take advantage of the Cd/program Files/mysql/mys QL Server 5.0/bin "command into

If we take our database information as a book or a dictionary, then the index can be understood as its directory, if we create a good directory, then we will retrieve information much faster, if we create a slag residue index, it may also bring down

First Kind : Check Slow Query of the SQL Grammar :   long_query_time = 2 ( more than Span style= "font-family: ' Times New Roman '" >2 seconds sql syntax recorded It is also a way to set a short point to record the error. ) The

Time_to_sec (now (), From_unixtime (Time field))/86400 Compute days, Time field type is UNIX timestamp1, time_to_sec (time) returns the time parameter that has been converted to seconds.2, Timediff (expr,expr2) returns the time between the start

Recently planned to write a set of books, that is, about MySQL optimization, then first write on the blog, then organized into a PDF of the form of documents, of course, also look forward to your attention. For MySQL optimization is a relatively

Starting with MySQL 5.1, Binlog supports the row-based format, which by default only sees some BASE-64 encoded information, such asdelimiter/*!*/; # at 7493962 #090827 5:25:03 server ID 1 end_log_pos 0 start:binlog v 4, server v

0. My mysq installation path is: D:\MYSQL1. Open cmd down cut-in discInput, D:Enter->CD "D:\MySql\MySQL Server 5.6\bin" Note the double quotes so we can cut into the MYSQL installation directory2. Enter MySQL Safe mode to start, that is, enter the

View the mysqlbinlogrow format Starting from MySQL 5.1, binlog supports the row-based format. By default, only some base64-encoded information can be seen, such DELIMITER /*! */;# At 7493962#090827 5:25:03 server id 1 end_log_pos 0 Start: binlog v 4,

Modify multiple data entries using mysqlupdateGenerally, the following SQL statement is used to update the field value:Copy codeThe Code is as follows:UPDATE mytable SET myfield = 'value' WHERE other_field = 'other _ value ';However, what if you

MySQL password change methods, yc sorting Reprinted please indicate the source http://blog.csdn.net/yc7369 MySQL password change methods I have sorted out the following four methods to change the root password in MySQL, which may be helpful to

Datatruncatedforcolumn in mysql 1. Describe your problems first. The data processed_f in the database is empty and has no value .... When you change the structure of a Data table, the message "Data truncated for column processed_f" appears ..

Having has some differences in Oracle and mysql In Oracle, having must be used in combination with group by, but in mysql, the situation is different and can be used separately. C: \ Documents ents and Settings \ guogang> sqlplus test/testSQL * Plus: