sql server case syntax

Oracle -- SQL syntax summary and oraclesql syntax Summary -- Statement block declare v_name varchar2 (30): = 'jack' -- defines the variable begin select v_name from dual; exception when others then dbms_output.put_line ('exception occurred '); end; -- if judge declare v_num1 number; v_num2 number; v_result varchar2 (10); begin if v_num1 is null or v_num2 is null

functions? For example, we only need to know who scored more than 60. In this case, we cannot use the WHERE command. What should we do? Fortunately, SQL provides a HAVING command, which we can use to achieve this goal. HAVING clauses are usually at the end of an SQL sentence. An SQL statement containing the HAVING cla

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, Update, Insert) DCL-Data Control Language (GRANT, REVOKE, COMMIT, ROLLBACK)

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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 Control Language (Grant,revoke,commit,rollback)First, a brief introduction

* from table name order by RND (ID)SQL Server: Select Top N * from table name order by newid ()Mysqlelect * from table name order by rand () limit nAccess left connection syntax (the left connection is used in recent development, access does not help anything, there is no access SQL instructions on the internet, only

it down for later check)Syntax elect table1.fd1,table1,fd2,table2.fd2 from table1 left joins Table2 onTABLE1.FD1,TABLE2.FD1 where ...Use SQL statements with ... Instead of a long string displayGrammar:SQL database: Select Case-len (field) >10 then left (field,10) + ' ... ' else field end asNEWS_NAME,NEWS_ID from TableNameAccess database: Select iif (len Field) >

table name ORDER by NEWID () Mysqlelect * FROM table name ORDER by rand () Limit n Access left connection syntax (recently developed to use left-side connection, access to help do not have any, the Internet does not have access to the SQL description, only Test yourself, now write it down for later investigation. Syntax elect table1.fd1,table1,fd2,table2.fd2 fro

handling of column fields SQL Case Do the column processing Sql> Select deptno,sum (SAL) from the EMP Group by DEPTNO; Select Case When deptno=10 Then ' ACCOUNTING ' When deptno=20 Then ' Reserch ' When deptno=30 Then ' SALES ' End sum (SAL) from EMP GROUP BY Deptno handling of column fields

, onlyTest yourself, and now write it down for later check)Syntax elect table1.fd1,table1,fd2,table2.fd2 from table1 left joins Table2 onTABLE1.FD1,TABLE2.FD1 where ...Use SQL statements with ... Instead of a long string displayGrammar:SQL database: Select Case-len (field) >10 then left (field,10) + ' ... ' else field end asNEWS_NAME,NEWS_ID from TableNameAccess