The SQL OR condition is used to test multiple conditions in a SELECT, INSERT, UPDATE, or DELETE statement. Any one of the conditions must be met for a record to be selected.Syntax The syntax for the OR condition in SQL is: WHERE condition1 OR condition2 ... OR condition_n; Parameters...
real_name_authentication ,address ,gender ,age ,referees ,register_time ,mobile ,cert_no ,mail ,qq ,account_remainder ,multiple_rank ,active_extent ,invest_frequency ,lately_invest_time ,invest_amount ,lifecycle ,bank_cards ,platform_id FROM custom_pandect_info p...
SELECTid,...,creator,modifier,create_time,update_timeFROMstatementWHERE(account_number='XXX'ANDcreate_time>='2022-04-24 06:03:44'ANDcreate_time<='2022-04-24 08:03:44'ANDdc_flag='C')ORDERBYtrade_date_timeDESC,idDESCLIMIT0,1000; 优化前:SQL 执行超时被 kill 了 SELECTid,...,creator,mo...
从上面的代码我们可以发现order和customers两个表格的名称重复出现,每次输入全名很麻烦,我们可以给表格给一个暂时的名字,使得输入更方便,例如将order命名为o,customers命名为c。 selectorder_id,o.customer_id,first_name,last_namefromordersojoincustomerscono.customer_id=c.customer_id 注:一旦为表格命名,在这段命...
4-Joining Multiple Tables 多表连接 5-Compound Join Conditions复合连接条件 6-Implicit Join Syntax隐式连接语法 7-Outer Joins 外连接 8-Outer Join Between Multiple Tables 多表外连接 9-Self Outer Joins自外连接 10-the USING Clause 子句 11-Natural Joins自然连接 12-Cross Joins交叉连接 13-Unions 联合...
PL/SQL Multiple-Choice Questions (MCQs)PL/SQL stands for "Procedural Language Extension of SQL". PL/SQL uses a block-structured syntax. Each of the logical blocks of PL/SQL can be nested into any number of subblocks.This section contains the PL/SQL MCQs on various topics such as ...
They are not very dependable as compared to NATURAL JOINS when joining multiple tables The JOIN..ON clause is similar to the WHERE clause which limits rows with conditions An additional WHERE clause is mandatory when the JOIN..ON clause is used None of the above...
Logical conditions can combine multiple conditions into a single condition. For example, you can use theANDcondition to combine two conditions: (1 = 1) AND (5 < 7) Here are some valid conditions: name = 'SMITH' employees.department_id = departments.department_id hire_date > '01-JAN-08'...
Each matching row is updated once, even if it matches the conditions multiple times. For multiple-table syntax, ORDER BY and LIMIT cannot be used.这是一位读者,发给我的截图,从操作层面,论证了这个问题, SQL> update testupdate1 t1, testupdate2 t2set t1.name =...
"resulting_condition": "multiple equal(21, `user`.`age`)" } ] } }, { "substitute_generated_columns": { } }, { "table_dependencies": [ { "table": "`user`", "row_may_be_null": false, "map_bit": 0, "depends_on_map_bits": [ ...