convert oracle sql to postgresql

Label:Datatypes translation between Oracle and SQL Server part 1:character, binary strings Datatypes translation is one of the most important things you need to consider when migrate your application from oneDatabase to the other. This is a article in the series so we talking about translate SQL query among different databases. This article would focused on conve

convert ('strutz', 'we8hp ', 'f7dec') "Conversion" from dual; Conver ------ Strutz 44. hextorawConverts a hexadecimal string to a binary string. 45. rawtohextConverts a binary string to a hexadecimal string. 46. rowidtocharConvert the rowid data type to the character type 47. to_char (date, 'format ') SQL> select to_char (sysdate, 'yyyy/MM/DD hh24: MI: ss') from dual; To_char (sysdate, 'yy ---------------

Functions in oracle are divided into character functions, number functions, date functions, empty processing functions, conversion functions, and other common functions. The following are some SQL functions commonly used in ORACLE: lower () function content conversion LOWER case SQLSELECTLOWER (T_NAME) FROMtest_partitioning2; lower (T_NAME )------------ Functions

I. Use of SQL1. IN OperatorSQL 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:ORACLE tries to convert it

Tags: Tips control oracl Programmer Practice Union Multiple full table scans causeI. Use of the SQL language1. in operatorThe advantages of SQL in write are easier to write and easy to understand, which is more suitable for modern software development style.But SQL performance with in is always lower, and the steps taken from

Tns_admin and the value is the path to the Tnsnames.ora file, for example: E:\oracleclient\instantclient_11_24.After installing Plsql, start, Cancel, and click Tools->preferences->connection:Oracle home=e:\oracleclient\instantclient_11_2OCI Library=e:\oracleclient\instantclient_11_2\oci.dllRestart Plsql, enter the user name, password, select the PL/SQL instance name to enter the database5.The initial login may have the problem of Chinese garbled, the

PLSQLPL/SQL developer is an Oracle Database DeveloperProgramIntegrated Unit Development Environment (IDE). With PL/SQL developer, you can easily create the server part of your client/server application. So far, you can do the following in the worst case:• Use a text editor to Write Program units (processes, triggers, and so on ).• Use

nullInefficiency: (indexes are not used)Select dept_code from Dept order by dept_typeEfficiency: (using indexes)Select dept_code from Dept where dept_type> 0 (30) Avoid changing the index column type .: Oracle automatically converts columns to different types of data.Assume that empno is a numeric index column.Select... From EMP where empno = '20140901'In fact, after Oracle type conversion, the statem

the actual need to adjust the data table pctfree and pctused parameters; Big Data table Delete, use TRUNCATE table instead of delete.With proper indexing, there are not too many indexes on a table in an OLTP application. Columns with large data repetition do not create a two-tree index, you can use a bitmap index, and the column order of the combined index is consistent with the order of the query criteria columns, and for tables with frequent data operations, indexes need to be rebuilt periodi

When converting an Oracle query to an SQL Server, you must be careful about some issues that are not easy to notice. We know that T-SQL is the language engine of SQL Server, while Oracle's language engine is PLSQL. Both query languages have extended the ANSI SQL-92 standard

contains the following columns: dept_code PK not null dept_desc not null dept_type null inefficient: (The index is not used) select dept_code from Dept order by dept_type efficiency: (using the index) select dept_code from Dept where dept_type> 0 (30)Avoid changing the index column type .:Oracle automatically converts columns to different types of data.Assume that empno is a numeric index column.Select... From EMP where empno = '20140901'In f

Does PHP have to connect with MySQL, Oracle, SQL Server line? Reply content: Does PHP have to connect with MySQL, Oracle, SQL Server line? PHP for each database system (Mysql/sqlite/postgresql/oracle/

modify: alter system set user_diagnostic_dest = 'd: \ oracle \ trace '; Or: select tracefile from v $ process where addr in (select paddr from v $ session where sid in (select sid from v $ mystat )); In addition, you can use the following SQL statement to directly find the current trace file name. SELECT d. VALUE | '\' | LOWER (RTRIM (I. INSTANCE, CHR (0) | '_ ora _' | p. spid | '. trc' AS "trace_file_name

digits if I omit M. The value of M can be negative, indicating that the number of m digits is truncated to the left of the decimal point. You can use round or floor under SQL Server. The following is an Oracle query: Select TRUNC (15.79,1) "Truncate" from DUAL; The following is a version of SQL Server for similar queries: SELECT ROUND (15.79, 0) rounded, ROUN

comparisons, including whitespace, character case), SQL does not need to be parsed (parsing) to be executed SQL, so try to maintain a uniform style of SQL.Error: Select E.emp_no from EMP E;Yes: SELECT e.emp_no from EMP e;1-2, the date format is clearIf you do not explicitly specify a time format, by default using the time format specified by the Nls_date_format parameter, you may not get the results you wa

SQL dialect configuration for oracle, mysql, and sqlserver databases in hibernate4 (SQL Dialects) Database Type Hibernate SQL Dialect DB2 Org. hibernate. dialect. DB2Dialect DB2 AS/400 Org. hibernate. dialect. DB2400Dialect DB2 OS390 Org. hibernate. dialect. DB2390Dialec

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 + expression)Convert ASCII to CHR