convert oracle sql to postgresql

Tags: format art drive different user name localhost com bcp micConfiguration of data sources in spring and JDBC driver packages for various databases (Oracle, MySQL, SQL Server, etc.)When developing a database-based application system. You need to configure the data source in your project to obtain a database connection for the operation of the database.The method of configuring data sources for different

TimeStandard Time for mst mdt Mountainous AreasNST standard time for new FinlandPst PDT Pacific Standard TimeYst ydt Yukon Standard Time Character functions supported by Oracle and Their Microsoft SQL Server equivalent functions: Functions: Oracle Microsoft SQL ServerConvert characters to ASCIIConcat (expression + exp

Oracle dynamic SQL statements are easy to use, but the assembly process is too annoying. Especially when the date field is involved in the Assembly Statement, the to_char must be added during the Assembly to convert it to a character first. Oracle dynamic SQL statements are

during use Select paraid,vvalue, Flowid,id To #wfmw02 from wfmb01c Common functions 1, NVL (expression 1, expression 2); --expression 1 is null return expression 22, Sysdate--system time3, InStr (character expression 1, character expression 2 [, Pos][,nth])Search for the position of "Expression 2" of "Nth" from the pos position of expression 1 (return 0 if not found)4, To_char (), To_date (), To_number () 1, isnull (expression 1, expression 2)2, GETDATE ()3, CHAR

Tags: PL/SQL developer do not install client connection to remote Oracle databasePL/SQL Developer is an integrated development environment designed specifically for the development of Oracle Database storage program units. Now that more and more business logic and application logic has shifted to

oracle| Data | database first, some concepts of relational databases 　　 1, the value of the primary key can not be changed generally 　　 2. Foreign key: A field that points to another table or to the primary key or unique key of this table. The value of a foreign key must be the same as a primary key, or it will be empty. 　　 3. Database-like: tables, views, sequences, indexes, synonyms, programs (processes, functions,

for the Where condition, you must note that you must write it to the beginning of the Where condition. 3. Indexing A table with a small number of records can be retained with a primary key index. Do not create other indexes. The full table scan is fast. It is best to create a tablespace for the index separately and re-build the index if necessary. Function indexes can be used if necessary, but are not recommended. Views in Oracle can also be ind

43. Convert (C, dset, sset)Convert the source string sset from one language character set to another destination dset Character Set SQL> select convert ('strutz', 'we8hp ', 'f7dec') "Conversion" from dual; Conver------Strutz 44. hextorawConverts a hexadecimal string to a binary string. 45. rawtohextConverts a binary s

convert ' * ' to all column names in the process of parsing, which is done by querying the data dictionary, which means more time is spent(4) Reduce access to the database: Oracle has done a lot of work internally: Parsing SQL statements, estimating index utilization, binding variables, reading data blocks, etc.;(5) Reset the ArraySize parameter in

When converting Oracle queries to SQL queries, you need to pay attention to a lot of issues. The following gives you a detailed analysis of the number trade-offs in converting Oracle queries to SQL queries for your reference. Number trade-offs Oracle Database has a TRUNC f

, Create a View grant resource, connect to yuan; ------------------------ authorize resources; otherwise, the table grant create session to yuan; ---------------------------- create a reply describe tables to query all table structures Oracle and SQL sewrver Common conversion functions Oracle conversion functions: www.2cto.com To_char ()

oracle. net Framework database access Program namespace: system. data. oracleclient. file Name: system. data. oracleclient. DLL, which is located in the global assembly cache. By default, VS 2005 does not reference this component. when used , you only need to add a reference. similar to sqlclient, The oracleclient namespace consists of oracleconnection, oraclecommand, oracledatareader, oracleparameter, and oracletype. The above lists the most comm

Oracle|sql Grammar | object | Data one. Data Control statement (DML) section 1.INSERT (Insert the statement into the data sheet) 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 for string types must be enclosed in single quotes, s

IN Operator SQL statements written IN are easy to write and understand, which is suitable for modern software development. However, SQL statements using IN always have low performance. The following differences exist between SQL statements using IN and SQL statements without IN: OR