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Soundex coding groups together words that appear to sound alike based on their spelling. For example, "can" and "khawn", "con" and "gone" wocould be equivalent under soundex coding.
Soundex Coding
-- Sentence skill
-- Data Operations
SELECT -- retrieve data rows and columns from database tables
INSERT -- add new data rows to the database table
DELETE -- DELETE data rows from a database table
UPDATE -- UPDATE data in the database table
-- Data
-- Sentence skill
1. Data OperationsSelect -- retrieve data rows and columns from database tablesInsert -- add new data rows to the database tableDelete -- delete data rows from a database tableUpdate -- update data in the database table
2.
PL/SQL single-line functions and group functionsA function is a program that has 0 or more parameters and has a return value. Oracle built a series of functions in SQL that can be called SQL or PLFunctions are divided into two main categories:Single-
Comparison of common functions for SQL Server to Oracle
1. Absolute ValueS: Select ABS (-1) ValueO: Select ABS (-1) value from dual
2. INTEGER (large)S: Select ceiling (-1.001) ValueO: Select Ceil (-1.001) value from dual
3. Round (small)S: Select
Generally, the entire string is used as the operation object, for example: search for a substring in a substring, obtain a substring, insert a substring at a certain position in the substring, and delete a substring.
Generally, the entire string is
String function string comparison function if the result length is greater than the maximum value of the max_allowed_packet system variable, the return value of the string value function is NULL. See section 7.5.2 "Adjust server Parameters ".
String
String functionsstring comparison functionsIf the length of the result is greater than the maximum value of the Max_allowed_packet system variable, the return value of the string value function is null. See section 7.5.2, "Tuning server parameters."
Previously, I wanted to record some of the usual functions of SQL, but it has not been implemented ... Hey...Until today, the substring () function is used, and in C # The starting value of this method is 0, and the starting value in SQL is 1. Silly
Generally, the entire string is used as the operation object, for example: search for a substring in a substring, obtain a substring, insert a substring at a certain position in the substring, and delete a substring. The required and sufficient
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