SELECT语句用于从数据库中查询数据,当在PL/SQL中使用SELECT语句时,要与INTO子句一起使用,查询的 返回值被赋予INTO子句中的变量,变量的声明是在DELCARE中。SELECT INTO语法如下: 1 2 3 4 SELECT[DISTICT|ALL]{*|column[,column,...]} INTO(variable[,variable,...] |record) FROM{table|(sub-query)}[alia...
select into 的用法结构是 SELECT [DISTICT|ALL]{*|column[,column,...]} INTO (variable[,variable,...] |record) FROM {table|(sub-query)}[alias] WHERE... 能类似实现此功能的语句有create table table1 as select * from table2 这句是先创建一个表,再复制结构和数据过去。 还有个就是insert int...
[], is_lob_column:false, is_joined_dup_column:false, is_unpivot_mocked_column:false, is_hidden:false, from_alias_table:false, is_rowkey_column:false, is_unique_key_column:false, is_mul_key_column:false, is_strict_json_column:0, srs_id:18446744073709551615, udt_set_id:0}, parents_...
BEGIN SET v_variable_name = value; END; 在声明和赋值变量后,可以在select语句中使用变量。可以使用冒号(:)前缀来引用变量。例如: SELECT column1, column2 FROM table_name WHERE column3 = :v_variable_name; 在上面的示例中,:v_variable_name是引用变量的方式。在执行查询时,Oracle会将变量替换为实际的...
SELECT log_group_type FROM all_log_groups WHERE OWNER = '<schema_name>' AND table_name = '<table_name>'; 每种补偿日志返回一行,结果中需要包含 ALL COLUMN LOGGING,或者 PRIMARY KEY LOGGING 和UNIQUE KEY LOGGING 都包含。 如果未打开表级别的补偿日志,请执行下述语句。 ALTER TABLE table_name ADD...
可以使用如下SQL语句查询特定索引的所有字段：sqlSELECT COLUMN_NAMEFROM ALL_IND_COLUMNSWHERE TABLE_NAME = 'A' 表名，注意大写AND INDEX_NAME = '索引名'; 索引名，可以在USER_INDEXES视图中查找2. 使用USER_IND_COLUMNS视图： 该视图包含当前用户拥有的所有表的索引列信息。 如果只关心当前...
=, or a user defined bind operator e.g.contains(e.job,:job,1)>0, and a change in the bind variable value maylead to a different plan, the cursor will be marked as bind sensitive. --当我们在SQL中使用<= 等操作时,在改变绑定变量就会生成一个不同的执行计划(Cursor),并将这个cursor标记...
In theEnvironment Variablesdialog box, in theSystem variableslist, select thePathvariable, and then clickEdit. In theEdit System Variabledialog box: if the path to the folder that contains sqlplus.exe is not present in theVariable valuetext box, edit the string to include it. ...
Before you run any connector operations, on your Oracle client, set the environment variable named ORA_NCHAR_LITERAL_REPLACE to TRUE. This setting enables NCHAR string literal replacement, which prevents data loss when string literals that contain characters beyond the database character set are inser...
Before you run any connector operations, on your Oracle client, set the environment variable named ORA_NCHAR_LITERAL_REPLACE to TRUE. This setting enables NCHAR string literal replacement, which prevents data loss when string literals that contain characters beyond the database character set are inser...