convert oracle sql to postgresql

By default, SQL Server queries are case-insensitive. That is, whereaABC is the same as wherea 'abc '. By default, SQL Server queries are case insensitive. That is, where a = 'abc' is the same as where a = 'abc '. However, we can determine whether the case is case sensitive by using the method. Method 1: Alter table tb (specify a column in a TABLE)Alter column colname nvarchar (100) COLLATE Chinese_P

Oracle index creation and SQL optimization tutorial, oraclesql Database index: The index has a single column index compound index. If a field in a table has primary key constraints and uniqueness constraints, Oracle automatically recommends a unique index on the corresponding constraint column. The database index mainly improves the access speed. Construction Pr

, 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

Time Hst hdt Alaska-Hawaii Standard Time Standard time for mst mdt mountainous areas NST standard time for new Finland Pst pdt Pacific Standard Time Yst ydt yukon Standard Time Character functions supported by Oracle and their Microsoft SQL Server equivalent functions: Functions: Oracle Microsoft SQL Server

of s,c respectively. 1) s=[0,49],c=[0,49], then R=C2 2) s=[0,49],c=[50,99], then r=c2+1 3) s=[50,99],c=[0,49], then r=c2-1 4) s=[50,99],c=[50,99], then R=C2 In short, it is close to the current year principle, if it is the same as the current year, if it is larger than the current one, then it is considered to be the current century ago First century, otherwise it is the next century. For example, take to_date a

BackgroundWhen using Oracle or other databases, using the LIKE keyword for fuzzy query is commonly used by people, in the use of pure Chinese environment is very easy to use, there are some wildcards can be used, but in a pure English environment, the size of the need to accurately match the problem, the main reason is the problem of string FL like '%{0}% ' and Here like after is a string, so there must be a size-sensitive problem. For e

Oracle SQL execution Flowchart _sql execution process First, the execution steps of the SQL statement:1 grammar analysis, the analysis of the syntax of the sentence is consistent with the norms, measuring the meaning of the expressions in the statement. 2 semantic analysis, check the existence of all the database objects involved in the statement, and the user

I. Data Control Statement (DML) 1. INSERT (INSERT the record statement into the data table) Insert into Table Name (field name 1, field name 2 ,......) VALUES (value 1, value 2 ,......);Insert into Table Name (field name 1, field name 2 ,......) SELECT field name 1, field name 2 ,...... FROM another table name; Field Values of the string type must be enclosed in single quotes, for example, 'good Day' If the field value contains single quotes and requires String Conversion, we replace it with two

I. Data Control statement (DML) section 1.INSERT (Insert the statement into the data sheet) INSERT INTO 表名(字段名1, 字段名2, ……) VALUES ( 值1, 值2, ……); INSERT INTO 表名(字段名1, 字段名2, ……) SELECT 字段名1, 字段名2, …… FROM 另外的表名; field values for string types must be enclosed in single quotes, such as: ' Good day ' If the field value contains a single quote ' that requires a string conversion, we replace it with two single quotes '. The value of a field with a string type exceeds the length of the definition,

DATABASE Archivelog ALTER DATABASE OPENView commands supported by Sqlplus Help INDEXUnlocking user Locks Executed with the user password set in the first step of installing Oracle (e.g., Sqlplus "sys/zhb126 as SYSDBA") Alter user Scott account unlock; Then execute Sqlplus scott/tiger, which will ask you to modify Scott's new password.Setting command line support spaces Set Sqlblanklines onVariable substitution-variable substitution-this process only

the operation is finished, backup V$sqlarea and store to newtable. Now that the preparation is done, the next step is to integrate the data. According to NewTable in last_active_time>sysdate get this executed SQL, and then the relevant metrics data is newtable minus oldtable (two table of the associated fields Hash_value and address, SQL_ID should also be available). Note that the new SQL appears in NewTa

Tags: Microsoft link library can kind of process SSIS for manual selfBackground: A sign in Oracle changed to SQL ServerWorkaround: 1, first think of Microsoft's solution:Microsoft SQL Server Migration Assistant v7.4 for Oraclehttps://www.microsoft.com/en-us/download/details.aspx?id=54258According to the introduction looks very cow B, installed after the death of

During development, you often need to write an SQL statement to insert information into the table. If the inserted data field is of the date type, you must convert the date type to the string type and insert it into the database using SQL statements. This is the only method of my field. If you have any questions, please kindly advise! My solution is to use the

:A. Needs to be queried from the database: Totalrecords. "SELECT COUNT (*) from TableName"B. The most basic needs of user-provided: PageSize and Pagenow. (Personally think this is the premise of pagination algorithm)C. Derived from other variables: TotalPages, Beginrow and Endrow. (it needs to be calculated that Beginrow and endrow are required for paging queries, TotalPages is the information that the page needs to provide). Specific formula for calculation: Totalpages:if ((totalrecord

I believe that the 99 SQL statements are handled, and the basic Oracle test is just like playing (the most comprehensive and most typical entry-level Oracle query statements in history) 1. select * from emp;2. select empno, ename, job from emp;3. select empno number, ename name, job from emp;4. select job from emp;5. select distinct job from emp;6. select distinc

This article provides an indirectExcelData Import inOracleMethod: UseSQL ServerClose relationships with Excel. in SQL Server, use the OpenDataSource method to read Excel and spell the data into an oracle-compliant SQL statement. Run the following code in SQL server: SELECT 'Update userinfo set Useducation = '''

1. the downloaded Oracle SQL Developer, rpm file,: http://www.oracle.com/technology/software/products/ SQL /index.html 2. install sun's jdk1.6, if installed, skip (linux mint 12 is installed by default) command: sudo apt-get install sun-java6-jdk www.2cto.com 3. oracl SQL Develoepr is a rpm package by default. To insta

--------------------- The following is the Oracle database ----------------------------- SQL statement Optimization Methods: 30 examples We often use hint in the SQL statement optimization process. Here we summarize the common Oracle hint usage in the SQL optimization proces

;ontable_name>(column_name);Composite Index:Create IndexI_deptno_job onEMP (deptno,job); —>index The DEPTNO, job column of the EMP table. Select * fromEmpwhereDeptno= the andJob='sals' -Walk the index. Select * fromEmpwhereDeptno= the ORJob='sals' -A full table scan will be performed. Do not go indexSelect * fromEmpwhereDeptno= the -Walk the index. Select * fromEmpwhereJob='sals' -Do a full table scan, do not go index.If there is an OR operator in the WHERE clause or a separate referenc

Tags: SQL Server link Oracle Insert queryMSSQL2008R2 Link ORACLE 11: To create a link: exec sp_addlinkedserver ' dblink_oracl ', ' ORACLE ', ' msdaora ', ' ORCL120 ' Where ORACL120 is the local installation of the Oracle driver, after Tnsnames.ora configured the link strin