oracle sql syntax

, field name 2 = value 2 ,...... Where condition; If the modified value n is not assigned a value or defined, the original record content will be cleared to null. It is best to perform non-null verification before modification;An error occurs when the value of N exceeds the defined length. It is best to verify the length before insertion .. Note:A. The preceding SQL statements have row-level locks applied to tables,After confirmation, you must add

TABLE Sys_user modify birthday char (10); Ø Delete Column birthday, have drop column keyword ALTER TABLE sys_user drop column birthday; Ø Modify the column name and attributes; Modify the birthday to CSRQ, and change the property to char (10) and not allow null not nulls ALTER TABLE Sys_user change birthday Csrq char (a) not null; 6) Modify the table name Rename table MyTable to youtable; 2. SQL SERVER Database 1) Create an index Create UNIQUE IND

1, field name 2 = value 2 ,...... WHERE condition; If the modified value N is not assigned a value or defined, the original record content will be cleared to NULL. It is best to perform non-NULL verification before modification; An error occurs when the value of N exceeds the defined length. It is best to verify the length before insertion .. Note: A. The preceding SQL statements have row-level locks applied to tables, After confirmation, you must ad

content will be cleared to null, preferably a non-null checksum before modification; The value n exceeds the length of the definition, and it is best to check the length before inserting. Precautions: A. The above SQL statement adds row-level locks to the table. After the confirmation is complete, must add the matter processing end the order COMMIT to take effect formally, Otherwise, the change is not necessarily written into the database. If y

; --------------------------------------------------------------------Cursor------------------------------------------------- --explicit cursors, reading employee information Declare cursorCur_emp (var_jobinch varchar2:='salesman') is SelectEmpno,ename,sal fromscott.empwhereJob=Var_job; Type Record_emp isrecord (Var_empno scott.emp.empno%type, Var_ename scott.emp.ename%type, var_sal scott.emp.sal%type); Emp_row record_emp; begin OpenCur_emp ('MANAGER'); FetchCur_emp intoEmp_row; whileC

This document creates two database spaces: one for storing data and the other for storing indexes. Note that the index space is small. User: SA, password: liuxuezong, service name: rtsos. 1. Create a service name 2. Create a tablespace File ----------------------------------------------------------------------------- Title: rtsos_tablespace. SQL ---- function: Create tablespaces and users for the 'rtsos 'database. ---- Project Team: rtsos tablespace/

remaining in the tablespace:Select tablespace_name, sum (bytes) Total bytes, max (bytes), count (*) from dba_free_space group by tablespace_name;Data Dictionary:Select table_name from dict order by table_name;Lock and Resource Information:Select * from v $ lock; DDL lock not includedDatabase character set:Select name, value $ from props $ where;Inin. ora parameters:Select name, value from v $ parameter order by name;SQL sharing pool:Select

,...... WHERE condition; If the modified value N is not assigned a value or defined, the original record content will be cleared to NULL. It is best to perform non-NULL verification before modification. If the value N exceeds the defined length, an error will occur, it is best to verify the length before inserting .. Note:A. the preceding SQL statement adds row-level locks to the table. After confirmation, the transaction processing command COMMIT mu

Dynamic SQL syntaxOnly at run time can Oracle check whether its format is correct. The INTO and USING clauses are optional. If the SQL statement is a query statement, we can use the INTO clause INTO statement to receive the record value selected by the SELECT statement. It can be a variable sequence or a record-type variable, that is, a record-type variable.The s

[SQL statement classification] DQL-Data Query Language (SELECT) DML-data operation language (INSERTUPDATEDELETEMERGE) DDL-Data Definition Language (CREATEALTERDROPTRUNCATE) DCL-Data Control Language (GRANTREVOKE) TCL-transaction control statement (COMMITROLLBACKSAVEPOINT) [query the base [SQL statement classification] DQL-Data Query Language (SELECT) DML-data operation language (INSERT/UPDATE/DELETE/MERGE)

table_name;Lock and Resource Information:Select * from v $ lock; DDL lock not includedDatabase character set:Select name, value $ from props $ where name = 'nls _ CHARACTERSET ';Inin. ora parameters:Select name, value from v $ parameter order by name;SQLSharing pool:Select SQL_ Text from v $ sqlarea;Database:Select * from v $ databaseControl file:Select * from V $ controlfile;Redo log file information:Select * from V $ logfile;Log File Information from the control file:Select * from V $ log;Dat

The syntax of SQL fuzzy query is"Select column from table where column like 'pattern ';".SQL provides four matching modes:1.% indicates any 0 or multiple characters. Statement:Select * from user where name like '% 3% ';We will find all the "three" names for "Michael", "three-legged cats", and "Tang sanzang;2. _ represents any single character. Statement:Select *

tree-like structure data[SQL] View plaincopydrop table article; CREATE TABLE Article ( ID number primary KEY, Cont varchar2 (4000), PID number, IsLeaf number (1),--0 Represents a non-leaf node, 1 represents a leaf node Alevel number (2) ) Create or Replace procedure P (v_pid article.pid%type,v_level binary_integer) is cursor C was select * from article where pid = V_pid; V_prestr VARCHAR2 (1024): = '; Begin For i in 1..v_level loop V_prest

statement recorded in the data table )Update table name SET field name 1= value 1, field name 2= value 2, ... WHERE condition;If the modified value n is not assigned or defined, it will clear the original record content to null, preferably before the modification of non-null check;A value of n exceeds the defined length error, preferably a length check before inserting:Precautions:A. The above SQL statement adds a row-level lock to the table, and aft

Tags: style blog color for AR data div log spTable operation Syntax DifferencesWhen building a table, only the self-increment syntax is different.The primary key (PRIMARY key), the foreign key (FOREIGN key), non-null (NOT NULL), unique (unique), and default (defaults) are the same, and the self-increment implementation is different.The following is a list of the 3 common database-building and initialization

= value 2, ... WHERE condition; If the modified value n is not assigned or defined, the original record content will be cleared to null, preferably a non-null checksum before modification; The value n exceeds the length of the definition, and it is best to check the length before inserting. Precautions:A. The above SQL statements add row-level locks to the table, confirm that after the completion of the process must be combined with the end of the o

Oracle syntax and oracle syntax Top number Select * FROM Table Where ROWNUM ROWNUM Date To_date () indicates the data that can be recognized by Oracle Update talbe set A1 = to_date ('"+ model. Tstamp. ToString () +"', 'yyyy-MM-DD HH24: MI: ss '); Auto-increment ID 1.

. Otherwise, it is changed to the name of the table, output modified data to a temporary table) Update pnset pn. id = case when t. id> ''then t. id else pn. id endoutput deleted. id into temporary table from table name pn with (nolock) join # temp t 13. query, insert, delete, sum, average, and maximum Select * from tableinsert into new_table (id, name) values (1, 'zhang san') delete from table where range select sum (field1) as sumvalue from table1select avg (field1) as avgvalue from table1selec

Basic Database SQL syntax and basic SQL syntax Reprint please indicate from Zhu jiayuan http://blog.csdn.net/zhgl7688 Basic Database SQL syntax 1. Create a SQL database, Open

Label:Error occurred while generating SQL file with power Designer [ERR] 1064-you has an error in your SQL syntax; Check the manual that corresponds t o your MySQL server version for the right syntax to use near ' int not null auto_increment comment ' user ID ', The solution The S