—–case语句(注意:在Oracle 9i 后引入) 语法: casevariablewhenvalue1thenstatements1;whenvalue2thenstatements2; ……thenvaluenthenstatementsn; [elseelse_statements;]endcase; ——依据variable表达式,选择相应的when子句执行 例: ——要求:根据评分结果(A、B···)输出评价 declare--Declare用于声明变量、游...
Oracle always performs necessary locking to ensure data concurrency, integrity, and statement-level read consistency. You can override these default locking mechanisms. For example, you might want to override the default locking of Oracle if:
CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched, the...
搜索式CASE语句有个能够产生boolean(true,false,null)的搜索条件,当特定搜索条件计算结果为TRUE时,会执行与该条件相关的语句组合。搜索式CASE语句的语法如下所示: CASE WHEN SEARCH CONDIDTION 1 THEN STATEMENT 1; WHEN SEARCH CONDIDTION2 THEN STATEMENT 2; ... WHEN SEARCH CONDIDTIONN THEN STATEMENT N; EL...
(String sql, DbType dbType, SQLParserFeature... features) { if (dbType == null) { dbType = DbType.other; } switch (dbType) { case oracle: case oceanbase_oracle: return new OracleStatementParser(sql, features); case mysql: case mariadb: case drds: { return new MySqlStatementParser(...
切换到Oracle用户,用如下命令解锁scott用户并将密码设置成tiger [root@11gdg1~]# su - oracle11gdg1->sqlplus/assysdbaSQL*Plus:Release11.2.0.3.0ProductiononTue Jul1409:59:362015Copyright(c)1982,2011,Oracle.Allrights reserved.Connectedto: OracleDatabase11g Enterprise EditionRelease11.2.0.3.0-64bit Produ...
To try out the CASE statement, we'll be writing some queries against theSakila Sample DatabaseusingNavicat Premium. It's a powerful database development and administration tool that can simultaneously connect to most popular databases, including MySQL, MariaDB, MongoDB, SQL Server, Oracle, Postgre...
FromOracle Database 23ai, theautomatic SQL transpilercan extract SQL expressions in PL/SQL. These are then part of the SQL statement, so at runtime it's as-if the function doesn't exist! To do this, ensure thesql_transpilerparameter ison(it'soffby default). When a function in thewhere...
CASEselectorWHENselector_value_1THENstatements_1WHENselector_value_1THENstatement_2 ...ELSEelse_statementsENDCASE;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) Let’s examine the syntax of the simpleCASEstatement in detail: 1) selector ...