Syntax SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSEL...
1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
The simple CASE statement has the following structure: CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE ...
由于utf8的校验规则都是ci(case insensitive),所以是不区分大小写, 如 但可以这样,加上binary 14.1.2 ALTER EVENT Syntax 事件修改语法 可修改其执行计划,可禁用与启用该事件执行,可重名该事件【ALTER EVENT ... RENAME TO ...】 14.1.3 ALTER LOGFILE GROUP Syntax logfile_group file_namesizeengine_name Al...
SELECT Statements: SyntaxNOTE: SQL commands are not case sensitive. The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and last name of all the students. ...
Adding aCASE STATEMENTpipeline step allows us to set the conditions for theWHENand theELSEjust like we did before, without having to type in the entire SQL syntax. Then after hiding the original ‘Provider’ column and using aREORDER COLUMNSstep and aPIVOT DATAstep we’ll get the same table...
SQL DELECT Statement Delete All Records SQL TOP, LIMIT or ROWNUM Clause TOP select TOP 3 * from costumers; LIMIT ROWNUM The three syntaxes above are equivalent. TOP PERCENT With a WHERE clause SQL MIN() AND MAX() SQL COUNT(),AVG() and SUM() Functions ...
Druid SQL Parser分三个模块:Parser,AST,Visitor。parser是将输入文本转换为ast(抽象语法树),parser有包括两个部分,Parser和Lexer,其中Lexer实现词法分析,Parser实现语法分析,AST是Abstract Syntax Tree的缩写,也就是抽象语法树。Visitor是遍历AST的手段,是处理AST最方便的模式。
Syntax SQLSyntax ❮ PreviousNext ❯ SQL Statements Most of the actions you need to perform on a database are done with SQL statements. SQL statements consist of keywords that are easy to understand. The following SQL statement returns all records from a table named "Customers":...
CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING. Transact-SQL Syntax Conventions Syntax Copy Simple CASE...