示例3:布尔表达式中带有变量的多重IF语句(Example 3: Multiple IF Statement with a variable in a Boolean expression) We can specify multiple SQL IF Statements and execute the statement accordingly. Look at the following example 我们可以指定多个SQL IF语句并相应地执行该语句。 看下面的例子 If a studen...
It executes the ELSE statement and prints the message for it. In this case, we have two SQL IF statements. The second IF statement evaluates to false, therefore, it executes corresponding ELSE statement We need to be careful in specifying conditions in multiple SQL IF statement. We might get...
Changing multiple values: If there is a change in prices or stock levels, then the UPDATE Statement can be used on multiple statements to update. Handling Inactive Records: The status of the account or subscriptions can be updated if it expires. Data Cleaning: The UPDATE Statement can be used...
SQL statements,:query clauseThe query clause is the most basic and indispensable part of a statement. The query clause defines the specific content to be queried based on a specific index field. You can specify multi...
报错:Update row with Key (id)=(xxxx) multiple times或者duplicate key value violates unique constraint 问题原因:违反唯一性约束,执行UPDATE、INSERT ON CONFLICT或INSERT操作时,主键存在重复数据。 解决方法: 若INSERT语法报错:可以改为INSERT INTO xx ON CONFLICT的语法,实现主键去重,详情请参见INSERT ON CONFLIC...
If integer is not a multiple of the database block size, Oracle rounds up (in bytes) to the next multiple. For example, if the database block size is 2048 and integer is 2050, Oracle allocates 4096 bytes (2 blocks). The maximum value is 32768 (32K), which is the largest Oracle ...
When condition1 is TRUE, one set of statements will be executed, and when both conditions are FALSE, a different set of statements will be executed.Answer: B) If the condition is TRUE, then you want statements to be executedExplanation:If the condition is TRUE, then you want statements to...
SQL is not a procedural language. Using one piece of SQL to do many different things usually results in a less-than-optimal result for each task. If you want SQL to accomplish different things, then write various statements, rather than writing one statement to do different things depending ...
sql_statement | statement_block: A single or multiple statements that need to be executed. To include multiple statements, enclosed them between BEGIN and END keywords. The ELSE block is optional. If the Boolean expression with the IF statement returns FALSE, then the control is passed to the...
If multiple rows are deleted with a single SQL statement, the values for the column in the historical rows are the same. A table can have only one row-end column. If data-type is not specified, the column is defined as TIMESTAMP(12) WITHOUT TIME ZONE. If data-type is specified, it...