PL/SQL script language value assignment statement syntax table and record comply with the type usage, select the statement if else usage anonymous block (1), assign value statement syntax PL/SQL values use: = "=" some rules need to be observed in
SQL statement case when then else end returns a qualified value, sqlcase
Case has two formats
Simple Case functions and Case search functions:
-- Simple Case function CASE sex WHEN '1' then' male 'when' 2' then' female 'else' other 'ends -- Case
MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,
https://blogs.msdn.microsoft.com/apgcdsd/2011/01/10/sql-1/First, IntroductionA problem that is highlighted in front of many developers or database administrators is the performance of the database system. The performance of the system is not ideal
Importing data from an Excel file to a SQL database is simple.
Importing data from an Excel file to a SQL database is simple.
-- Importing data from an Excel file to a SQL database is simple. Use the following statement:
/* =========================
The following statements in the complete SQL operation are Mssql statements and cannot be used in access.
The following statements in the complete SQL operation are Mssql statements and cannot be used in access.
SQL classification:
DDL-Data
MySQL's most basic SQL syntax/statementMySQL's most basic SQL syntax/statement, using MySQL friends can refer to below. ddl-Data Definition language (create,alter,drop,declare)dml-Data Manipulation Language (Select,delete,update,insert)dcl-Data
Case has two formats. Simple case function and case search function.--Simple Case functionCase SexWhen ' 1 ' Then ' men 'When ' 2 ' then ' women 'Else ' other ' END--case search functioncase If sex = ' 1 ' Then ' man 'When sex = ' 2 ' Then ' women
Case has two formats. Simple case function and case search function.--Simple Case functionCase SexWhen ' 1 ' Then ' men 'When ' 2 ' then ' women 'Else ' other ' END--case search functioncase If sex = ' 1 ' Then ' man 'When sex = ' 2 ' Then ' women
MySQL is the most basic SQL syntax. For more information, see.
The most basic SQL syntax/Statement of MySQL. For more information, see.
DDL-Data Definition Language (Create, Alter, Drop, DECLARE)
DML-data manipulation language (Select, Delete,
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.