sqyog報錯
報錯提示：
There was error(s) while executing the queries .
The query and the error message has been logged at:
C:\Users\50800\AppData\Roaming\SQLyog\sqlyog.err.
Please click on “Open Error File…” to open the error file.
報錯文件提示：
查詢：
SELECT last_name , job_id , salary AS sal
FROM employees；
出錯處：2020-03-21 19:25:05
行號：3
錯誤代碼： 1146 - Table ‘girls.employees’ doesn’t exist查詢：
SELECT last_name , job_id , salary AS sal
FROM employees；
出錯處：2020-03-21 19:37:04
行號：3
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
語法：
select
查詢列表
from
表名
where
篩選條件;
分類：
一、按條件表達式篩選
簡單條件運算符：> < = != <> >= <=
二、按邏輯表達式篩選
邏輯運算符：
作用：用於連接條件表達式
&& || !
and or not
&&和and：兩個條件都爲true，結果爲true，反之爲false
||或or： 只要有一個條件爲true，結果爲true，反之爲false
!或not： 如果連接的條件本身爲false，結果爲true，反之爲false
三、模糊查詢
like
between and
in
is null
*/
SELECT
*
FROM
employees
WHERE
salary>12000
出錯處：2020-03-21 19:38:47
行號：43
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
語法：
select
查詢列表
from
表名
where
篩選條件;
分類：
一、按條件表達式篩選
簡單條件運算符：> < = != <> >= <=
二、按邏輯表達式篩選
邏輯運算符：
作用：用於連接條件表達式
&& || !
and or not
&&和and：兩個條件都爲true，結果爲true，反之爲false
||或or： 只要有一個條件爲true，結果爲true，反之爲false
!或not： 如果連接的條件本身爲false，結果爲true，反之爲false
三、模糊查詢
like
between and
in
is null
*/
SELECT
*
FROM
employees
WHERE
salary>12000
出錯處：2020-03-21 19:38:57
行號：43
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
department_id
FROM
employees
WHERE
department_id<>90
出錯處：2020-03-21 19:38:57
行號：53
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
salary,
commission_pct
FROM
employees
WHERE
salary>=10000 AND salary<=20000；
出錯處：2020-03-21 19:38:57
行號：66
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
*
FROM
employees
WHERE
NOT(department_id>=90 AND department_id<=110) OR salary>15000
出錯處：2020-03-21 19:38:57
行號：73
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
like
between and
in
is null|is not null
/
/
特點：
①一般和通配符搭配使用
通配符：
% 任意多個字符,包含0個字符
_ 任意單個字符
、
select
*
from
employees
where
last_name like ‘%a%’;#abc
select
last_name,
salary
FROM
employees
WHERE
last_name LIKE ‘__n_l%’;
SELECT
last_name
FROM
employees
WHERE
last_name LIKE ‘_KaTeX parse error: Expected group after '_' at position 1: _̲%' ESCAPE '’;
/
①使用between and 可以提高語句的簡潔度
②包含臨界值
③兩個臨界值不要調換順序
*/
SELECT
*
FROM
employees
WHERE
employee_id >= 120 AND employee_id<=100
出錯處：2020-03-21 19:38:57
行號：137
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
*
FROM
employees
WHERE
employee_id BETWEEN 120 AND 100
出錯處：2020-03-21 19:38:57
行號：144
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
含義：判斷某字段的值是否屬於in列表中的某一項
特點：
①使用in提高語句簡潔度
②in列表的值類型必須一致或兼容
③in列表中不支持通配符
*/
SELECT
last_name,
job_id
FROM
employees
WHERE
job_id = ‘IT_PROT’ OR job_id = ‘AD_VP’ OR JOB_ID =‘AD_PRES’
出錯處：2020-03-21 19:38:57
行號：164
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
job_id
FROM
employees
WHERE
job_id IN( ‘IT_PROT’ ,‘AD_VP’,‘AD_PRES’)
出錯處：2020-03-21 19:38:57
行號：175
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
=或<>不能用於判斷null值
is null或is not null 可以判斷null值
*/
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct IS NULL
出錯處：2020-03-21 19:38:57
行號：194
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct IS NOT NULL
出錯處：2020-03-21 19:38:57
行號：204
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
salary IS 12000
出錯處：2020-03-21 19:38:57
行號：214
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘12000’ at line 7查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct <=>NULL
出錯處：2020-03-21 19:38:57
行號：227
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
salary
FROM
employees
WHERE
salary <=> 12000
出錯處：2020-03-21 19:38:58
行號：238
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
IS NULL:僅僅可以判斷NULL值，可讀性較高，建議使用
<=> :既可以判斷NULL值，又可以判斷普通的數值，可讀性較低
出錯處：2020-03-21 19:38:58
行號：269
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘IS NULL:僅僅可以判斷NULL值，可讀性較高，建議使用
<=> :既’ at line 1查詢：
/*
語法：
select
查詢列表
from
表名
where
篩選條件;
分類：
一、按條件表達式篩選
簡單條件運算符：> < = != <> >= <=
二、按邏輯表達式篩選
邏輯運算符：
作用：用於連接條件表達式
&& || !
and or not
&&和and：兩個條件都爲true，結果爲true，反之爲false
||或or： 只要有一個條件爲true，結果爲true，反之爲false
!或not： 如果連接的條件本身爲false，結果爲true，反之爲false
三、模糊查詢
like
between and
in
is null
*/
SELECT
*
FROM
employees
WHERE
salary>12000
出錯處：2020-03-21 19:38:59
行號：43
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
department_id
FROM
employees
WHERE
department_id<>90
出錯處：2020-03-21 19:38:59
行號：53
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
salary,
commission_pct
FROM
employees
WHERE
salary>=10000 AND salary<=20000
出錯處：2020-03-21 19:38:59
行號：66
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
*
FROM
employees
WHERE
NOT(department_id>=90 AND department_id<=110) OR salary>15000
出錯處：2020-03-21 19:38:59
行號：73
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
like
between and
in
is null|is not null
/
/
特點：
①一般和通配符搭配使用
通配符：
% 任意多個字符,包含0個字符
_ 任意單個字符
、
select
*
from
employees
where
last_name like ‘%a%’;#abc
select
last_name,
salary
FROM
employees
WHERE
last_name LIKE ‘__n_l%’;
SELECT
last_name
FROM
employees
WHERE
last_name LIKE ‘_KaTeX parse error: Expected group after '_' at position 1: _̲%' ESCAPE '’;
/
①使用between and 可以提高語句的簡潔度
②包含臨界值
③兩個臨界值不要調換順序
*/
SELECT
*
FROM
employees
WHERE
employee_id >= 120 AND employee_id<=100
出錯處：2020-03-21 19:38:59
行號：137
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
*
FROM
employees
WHERE
employee_id BETWEEN 120 AND 100
出錯處：2020-03-21 19:38:59
行號：144
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
含義：判斷某字段的值是否屬於in列表中的某一項
特點：
①使用in提高語句簡潔度
②in列表的值類型必須一致或兼容
③in列表中不支持通配符
*/
SELECT
last_name,
job_id
FROM
employees
WHERE
job_id = ‘IT_PROT’ OR job_id = ‘AD_VP’ OR JOB_ID =‘AD_PRES’
出錯處：2020-03-21 19:38:59
行號：164
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
job_id
FROM
employees
WHERE
job_id IN( ‘IT_PROT’ ,‘AD_VP’,‘AD_PRES’)
出錯處：2020-03-21 19:38:59
行號：175
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
/*
=或<>不能用於判斷null值
is null或is not null 可以判斷null值
*/
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct IS NULL
出錯處：2020-03-21 19:38:59
行號：194
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct IS NOT NULL
出錯處：2020-03-21 19:38:59
行號：204
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
salary IS 12000
出錯處：2020-03-21 19:38:59
行號：214
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘12000’ at line 7查詢：
SELECT
last_name,
commission_pct
FROM
employees
WHERE
commission_pct <=>NULL
出錯處：2020-03-21 19:38:59
行號：227
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
SELECT
last_name,
salary
FROM
employees
WHERE
salary <=> 12000
出錯處：2020-03-21 19:38:59
行號：238
錯誤代碼： 1109 - Unknown table ‘employees’ in information_schema查詢：
IS NULL:僅僅可以判斷NULL值，可讀性較高，建議使用
<=> :既可以判斷NULL值，又可以判斷普通的數值，可讀性較低
出錯處：2020-03-21 19:38:59
行號：269
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘IS NULL:僅僅可以判斷NULL值，可讀性較高，建議使用
<=> :既’ at line 1查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 13:27:57
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 13:28:31
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 13:48:32
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 13:48:44
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 14:02:04
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 14:02:17
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 14:02:28
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3查詢：
SELECT employee_id,job_id,last_name
FROM employees
ORDER BY department_id DESC ,city salary
出錯處：2020-03-22 14:04:19
行號：6
錯誤代碼： 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘salary’ at line 3
怎麼解決