substring function in sql

The syntax of the SQL Advanced (9) function function syntax for built-in SQL functions is:SELECT function (column) from tableThe type of function in SQL, the basic

Resolve | command line uses Uniread to solve the Sql*plus command line history callback function under Linux Author: fenng you know that the Sql*plus in the Windows platform command line has the function of a command-line history callback, under the Sql*plus tool, y

column_name14. HavingThe addition of the HAVING clause in SQL is because the WHERE keyword cannot be used with the aggregate function.Syntax: SELECT column_name, Aggregate_function (column_name)From table_nameWHERE column_name operator ValueGROUP by column_nameHaving aggregate_function (column_name) operator valueExample: Select Customer,sum (orderprice) from OrdersGROUP BY CustomerHaving sum (orderprice) 15, UCase ()Definition: The UCASE

You can understand that by using simple DATEDIFF and DATEADD functions, you can find many different dates that may be meaningful. All the examples so far only calculate the number of time intervals between the current time and "", and then add it The date is calculated based on the time interval of "1900-01-01. Assume that you modify the number of time intervals or use different time intervals to call The DATEADD function, or subtract the time interv

2013-04-25 This error is prompted during compilation. I searched it. It turns out that if the function is not defined in the header, the SQL statement cannot see this function. Therefore, if you want to use this function at the SQL level, this

Sql-function Create function Database output results are separated by commas, and in development there are also many arguments passed in the form of comma-string arguments (not recommended when data is large). For example: Find the name "John, Li II" data in the database at this time to do this parameter processing as shown: The

SQL Server function converts renminbi numbers to uppercase CREATE FUNCTION [dbo]. [F_num_chn] (@num numeric (14,5)) RETURNS varchar with encryption As BEGIN DECLARE @n_data VARCHAR (VARCHAR), @c_data (a), @n_str VARCHAR (a), @i int SET @n_data =right (+cast (ABS (@num *100) as bigint) as varchar (20)), 14 SET @c_data = ' SET @i=1 While @i BEGIN SET @n_

/* T-sql:17 a date-time related Custom function (UDF), Sunday as the last day of the week, not affected by the @ @DateFirst, language version are collected or refined from the old articles! Tips: (@ @Datefirst + datepart (weekday, @Date))% 7 judgment Week is the most insured! Independent of @ @DateFirst and language version @ @DateFirst may cause datepart (weekday, @Date) different! No matter what the @ @Da

,=3000 when sale value =1000 translation to a , if other values are translated as other;SQL is as follows:Select Monthid, decode (sale,1000, ' D ', +, ' C ', +, ' B ', 4000, ' A ', ' other ') sale from outputSpecial cases:If you are comparing with only one valueSelect Monthid, decode (sale, NULL, '---', sale) sale from outputThatif (sale==null)Return "---"ElseSaleAnother: Decode can use other functions, such as the NVL

user emai is displayed, it becomes the password to display the administrator. However, often things are not so simple, the first to find vulnerabilities, and then construct such statements to consider the type of each field, so that the int or samllint type of field display varchar is obviously inappropriate. This is the last thing to say. If the problem SQL statement has only one or two fields to do, we want to know a lot of things, one or two fi

Tags: from date RDA car SQL statement max ble custom minMIN () functionThe Min function returns the minimum value in a column. NULL values are not included in the calculation.SQL MIN () syntaxSELECT MIN (column_name) from table_name Note: MIN and MAX can also be used for text columns to get the highest or lowest values in alphabetical order.SQL MIN () instanceWe have the following "Orders" table:

FORMAT () functionThe Format function is used for formatting the display of a field.SQL FORMAT () syntaxSELECT FORMAT (Column_name,format) from table_name Parameters Description column_name Necessary. The field to format. Format Necessary. prescribed format. SQL FORMAT () instanceWe have the following "Products" table: p

The simplest of My SQL database is the use of the limit function of MySQL, limit [offset,] rows The statement that starts retrieving N records from a database table with M Records is:SELECT * FROM table name LIMIT m,n Where limit is optional, for example we have a student table, we select the first 5 records can use the following SQL statementSELECT * from stude

Tags: statistic model near core Ali column embedded check createdWrite stored procedures, SQL function statementsEach of the team is very likely to has the following tables in the existing model. Use the Excel data provided with this phase link:PATIENT (some teams called it EMPLOYEE or CUSTOMER)-if needed, alter your PATIENT table to include the ' fields ' in the imported PATIENT Excel file. Do not remove e

Tags: func sele body maintains tab data between running SQLSqlDate function SQL Date (Dates)When we work on dates, the hardest task is to ensure that the date you insert is formatted to match the format of the date column in the database. As long as your data contains only the date parts, running the query will not be a problem. However, if the time part is involved, the situation is a bit complicate

Tags: sqlSQL Advanced (7) Date function SQL dates when we work on dates, the hardest task is to make sure that the date is inserted in a format that matches the format of the date column in the database.As long as the data contains only the date parts, running the query will not be a problem. However, if time is involved, the situation is a little more complicated.Before we discuss the complexity of the dat

The SQL String concatenation function uses CONCAT () in the SQL String concatenation function. The CONCAT () syntax is as follows: CONCAT (string 1, string 2, string 3 ,...): concatenates string 1, string 2, string 3, and other words The SQL String concatenation

PHP implements the function of verifying and Processing Form submission data [preventing SQL injection and XSS attacks, etc.] And sqlxss This example describes how PHP can verify and process data submitted by forms. We will share this with you for your reference. The details are as follows: XSS attack protection code: /*** Security filter function ** @ param $ st

SQL string Substitution handler function Create function Dbo.regexreplace(@source varchar (5000),--Original string@regexp varchar (1000),--Regular expression@replace varchar (1000),--Replacement value@globalreplace bit = 0,--whether it is a global replacement@ignorecase bit = 0-is the size ignored?)Returns varchar (1000) ASBeginDECLARE @hr integerDECLARE @obj

encrypt the user's password. SELECT PASSWORD (' 123 ')->*23ae809ddacaf96af0fd78ed04b6a265e05aa2572, MD5 The MD5 (str) function hashes the string str and can be used for some common data encryption that does not require decryption. SELECT MD5 (' 123 ')->202cb962ac59075b964b07152d234b70 3, ENCODE (STR,PSWD_STR) and decode (CRYPT_STR,PSWD_STR) The Encode function can use the encrypted password Pswd_str to enc